EP3466959A1 - Nucléosides substitués, nucléotides et leurs analogues - Google Patents

Nucléosides substitués, nucléotides et leurs analogues Download PDF

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EP3466959A1
EP3466959A1 EP18196511.2A EP18196511A EP3466959A1 EP 3466959 A1 EP3466959 A1 EP 3466959A1 EP 18196511 A EP18196511 A EP 18196511A EP 3466959 A1 EP3466959 A1 EP 3466959A1
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Prior art keywords
optionally substituted
formula
alkyl
compound
hydrogen
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Leonid Beigelman
Guangyi Wang
David Bernard Smith
Jerome Deval
Marija Prhavc
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Janssen Biopharma Inc
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Janssen Biopharma Inc
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    • C07—ORGANIC CHEMISTRY
    • C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H19/00—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof
    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
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    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
    • C07H19/06—Pyrimidine radicals
    • C07H19/073—Pyrimidine radicals with 2-deoxyribosyl as the saccharide radical
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
    • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
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    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/04—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
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    • C07D405/14—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing three or more hetero rings
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D473/00—Heterocyclic compounds containing purine ring systems
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    • C07D473/18—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6 one oxygen and one nitrogen atom, e.g. guanine
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    • C07D473/32—Nitrogen atom
    • C07D473/34—Nitrogen atom attached in position 6, e.g. adenine
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    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/04—Ortho-condensed systems
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    • C07D493/02—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system in which the condensed system contains two hetero rings
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    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
    • C07H19/06—Pyrimidine radicals
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    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
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    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
    • C07H19/14—Pyrrolo-pyrimidine radicals
    • C—CHEMISTRY; METALLURGY
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    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
    • C07H19/16—Purine radicals
    • C—CHEMISTRY; METALLURGY
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    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
    • C07H19/16—Purine radicals
    • C07H19/173—Purine radicals with 2-deoxyribosyl as the saccharide radical
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H19/00—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof
    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
    • C07H19/16—Purine radicals
    • C07H19/20—Purine radicals with the saccharide radical esterified by phosphoric or polyphosphoric acids
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    • C07—ORGANIC CHEMISTRY
    • C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
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    • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
    • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
    • C07H19/16—Purine radicals
    • C07H19/20—Purine radicals with the saccharide radical esterified by phosphoric or polyphosphoric acids
    • C07H19/207—Purine radicals with the saccharide radical esterified by phosphoric or polyphosphoric acids the phosphoric or polyphosphoric acids being esterified by a further hydroxylic compound, e.g. flavine adenine dinucleotide or nicotinamide-adenine dinucleotide
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    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/10—Transferases (2.)
    • C12N9/12—Transferases (2.) transferring phosphorus containing groups, e.g. kinases (2.7)
    • C12N9/1241—Nucleotidyltransferases (2.7.7)
    • C12N9/127—RNA-directed RNA polymerase (2.7.7.48), i.e. RNA replicase
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    • C12Y—ENZYMES
    • C12Y207/00—Transferases transferring phosphorus-containing groups (2.7)
    • C12Y207/07—Nucleotidyltransferases (2.7.7)
    • C12Y207/07048—RNA-directed RNA polymerase (2.7.7.48), i.e. RNA replicase

Definitions

  • the present application relates to the fields of chemistry, biochemistry and medicine. More particularly, disclosed herein are nucleoside, nucleotides and analogs thereof, pharmaceutical compositions that include one or more nucleosides, nucleotides and analogs thereof, and methods of synthesizing the same. Also disclosed herein are methods of ameliorating and/or treating a paramyxovirus and/or an orthomyxovirus viral infection with one or more nucleosides, nucleotides and analogs thereof.
  • Respiratory viral infections including upper and lower respiratory tract viral infections, infects and is the leading cause of death of millions of people each year.
  • Upper respiratory tract viral infections involve the nose, sinuses, pharynx and/or larynx.
  • Lower respiratory tract viral infections involve the respiratory system below the vocal cords, including the trachea, primary bronchi and lungs.
  • Nucleoside analogs are a class of compounds that have been shown to exert antiviral activity both in vitro and in vivo, and thus, have been the subject of widespread research for the treatment of viral infections. Nucleoside analogs are usually therapeutically inactive compounds that are converted by host or viral enzymes to their respective active antimetabolites, which, in turn, may inhibit polymerases involved in viral or cell proliferation. The activation occurs by a variety of mechanisms, such as the addition of one or more phosphate groups and, or in combination with, other metabolic processes.
  • Some embodiments disclosed herein relate to a compound of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing.
  • Some embodiments disclosed herein relate to methods of ameliorating and/or treating a paramyxovirus viral infection that can include administering to a subject suffering from the paramyxovirus viral infection an effective amount of one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, or a pharmaceutical composition that includes one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing.
  • Other embodiments described herein relate to using one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, in the manufacture of a medicament for ameliorating and/or treating a paramyxovirus viral infection.
  • Still other embodiments described herein relate to compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, that can be used for ameliorating and/or treating a paramyxovirus viral infection.
  • methods of ameliorating and/or treating a paramyxovirus viral infection can include contacting a cell infected with the paramyxovirus with an effective amount of one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, or a pharmaceutical composition that includes one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing.
  • Some embodiments disclosed herein relate to methods of inhibiting the replication of a paramyxovirus that can include contacting a cell infection with the paramyxovirus with an effective amount of one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, or a pharmaceutical composition that includes one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing.
  • the paramyxovirus viral infection can be caused by a henipavirus, a morbillivirus, a respirovirus, a rubulavirus, a pneumovirus (including a respiratory syncytial viral infection), a metapneumovirus, hendravirus, nipahvirus, measles, sendai virus, mumps, a human parainfluenza virus (HPIV-1, HPIV-2, HPIV-3 and HPIV-4) and/or a metapneumovirus.
  • Some embodiments disclosed herein relate to methods of ameliorating and/or treating an orthomyxovirus viral infection that can include administering to a subject suffering from the orthomyxovirus viral infection an effective amount of one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, or a pharmaceutical composition that includes one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing.
  • Other embodiments described herein relate to using one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, in the manufacture of a medicament for ameliorating and/or treating an orthomyxovirus viral infection.
  • Still other embodiments described herein relate to compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, that can be used for ameliorating and/or treating an orthomyxovirus viral infection.
  • methods of ameliorating and/or treating an orthomyxovirus viral infection can include contacting a cell infected with the orthomyxovirus with an effective amount of one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, or a pharmaceutical composition that includes one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing.
  • Some embodiments disclosed herein relate to methods of inhibiting the replication of an orthomyxovirus that can include contacting a cell infection with the orthomyxovirus with an effective amount of one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing, or a pharmaceutical composition that includes one or more compounds of Formula (I), Formula (II) and/or Formula (III), or a pharmaceutically acceptable salt of the foregoing.
  • the orthomyxovirus viral infection can be an influenza viral infection (such as influenza A, B and/or C).
  • Some embodiments disclosed herein relate to methods of ameliorating and/or treating a paramyxovirus viral infection and/or an orthomyxovirus viral infection that can include administering to a subject suffering from the viral infection an effective amount of a compound described herein or a pharmaceutically acceptable salt thereof (for example, one or more compounds of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing), or a pharmaceutical composition that includes one or more compounds described herein, in combination with one or more agents described herein.
  • a compound described herein or a pharmaceutically acceptable salt thereof for example, one or more compounds of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing
  • Some embodiments disclosed herein relate to methods of ameliorating and/or treating a paramyxovirus viral infection and/or an orthomyxovirus viral infection that can include contacting a cell infected with the virus with an effective amount of a compound described herein or a pharmaceutically acceptable salt thereof (for example, one or more compounds of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing), or a pharmaceutical composition that includes one or more compounds described herein, in combination with one or more agents described herein.
  • a compound described herein or a pharmaceutically acceptable salt thereof for example, one or more compounds of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing
  • Figure 1 shows example RSV agents.
  • Paramyxoviridae family is a family of single stranded RNA viruses.
  • Several genera of the paramyxoviridae family include henipavirus, morbillivirus, respirovirus, rubulavirus, pneumovirus and metapneumovirus. These viruses can be transmitted person to person via direct or close contact with contaminated respiratory droplets or fomites.
  • Species of henipavirus include hendravirus and nipahvirus.
  • a species of morbillivirus is measles.
  • Species of respirovirus include sendai virus and human parainfluenza viruses 1 and 3; and species of rubulavirus include mumps virus and human parainfluenza viruses 2 and 4.
  • a species of metapneumovirus is human metapneumovirus.
  • RSV Human Respiratory Syncytial Virus
  • Symptoms of an RSV infection include coughing, sneezing, runny nose, fever, decrease in appetite, and wheezing.
  • RSV is the most common cause of bronchiolitis and pneumonia in children under one year of age in the world, and can be the cause of tracheobronchitis in older children and adults. In the United States, between 75,000 and 125,000 infants are hospitalized each year with RSV. Among adults older than 65 years of age, an estimated 14,000 deaths and 177,000 hospitalizations have been attributed to RSV.
  • Treatment options for people infected with RSV are currently limited. Antibiotics, usually prescribed to treat bacterial infections, and over-the-counter medication are not effective in treating RSV and may help only to relieve some of the symptoms. In severe cases, a nebulized bronchodilator, such as albuterol, may be prescribed to relieve some of the symptoms, such as wheezing.
  • RespiGram® RSV-IGIV, Medlmmune, approved for high risk children younger than 24 months of age
  • Synagis® palivizumab, Medlmmune, approved for high risk children younger than 24 months of age
  • Virzole® ribavirin by aerosol, ICN pharmaceuticals
  • Symptoms of the measles include fever, cough, runny nose, red eyes and a generalized rash. Some individuals with measles can develop pneumonia, ear infections and bronchitis. Mumps leads to swelling of the salivary glands. Symptoms of mumps include fever, loss of appetite and fatigue. Individuals are often immunized against measles and mumps via a three-part MMR vaccine (measles, mumps, and rubella). Human parainfluenza virus includes four serotypes types, and can cause upper and lower respiratory tract infections. Human parainfluenza virus 1 (HPIV-1) can be associated with croup; human parainfluenza virus 3 (HPIV-3) can be associated with bronchiolitis and pneumonia. According to the Centers of Disease Control and Prevention (CDC), there are no vaccines against human parainfluenza virus.
  • HPIV-1 Human parainfluenza virus 1
  • HPIV-3 human parainfluenza virus 3
  • CDC Centers of Disease Control and Prevention
  • Influenza is a single stranded RNA virus and a member of the Orthomyxoviridae family. There are currently three species of influenza; influenza A, influenza B and influenza C. Influenza A has been further classified based on the viral surface proteins into hemagglutinin (H or HA) and neuramididase (N). There are approximately 16 H antigens (HI to H16) and 9 N antigens (N1 to N9).
  • Influenza A includes several subtype, including H1N1, H1N2, H2N2, H3N1, H3N2, H3N8, H5N1, H5N2, H5N3, H5N8, H5N9, H7N1, H7N2, H7N3, H7N4, H7N7, H9N2, H10N7.
  • influenza viruses can be transmitted from person to person via direct contact with infected secretions and/or contaminated surfaces or objections.
  • Complications from an influenza viral infection include pneumonia, bronchitis, dehydration, and sinus and ear infections.
  • Medications currently approved by the FDA against an influenza infection include amantadine, rimantadine, Relenza® (zanamivir, GlaxoSmithKline) and Tamiflu® (oseltamivir, Genentech).
  • any "R" group(s) such as, without limitation, R 1A , R 2A , R 3A , R 4A , R 5A , R 6A , R 7A , R 8A , R 9A , R 10A , R 11A , R 12A , R 13A , R 14A , R 15A , R 16A , R 17A , R 18A , R 19A , R 20A , R 21A , R 22A , R 23A , R 24A , R 25A , R 26A , R 27A , R 28A , R 29A , R 30A , R 31A , R 32A , R 33A , R 34A , R 35A , R 36A , R 37A , R 38A , R 1B , R 2B , R 3B , R 4B , R 5B , R 6B , R 7B , R 8B , R 9B , R
  • R group may be substituted or unsubstituted. If two "R" groups are described as being “taken together” the R groups and the atoms they are attached to can form a cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl or heterocycle. For example, without limitation, if R a and R b of an NR a R b group are indicated to be “taken together,” it means that they are covalently bonded to one another to form a ring:
  • R groups are not limited to the variables or substituents defined previously.
  • the indicated “optionally substituted” or “substituted” group may be substituted with one or more group(s) individually and independently selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, heteroaralkyl, (heteroalicyclyl)alkyl, hydroxy, protected hydroxyl, alkoxy, aryloxy, acyl, mercapto, alkylthio, arylthio, cyano, halogen, thiocarbonyl, O-carbamyl, N-carbamyl, O-thiocarbamyl, N-thiocarbamyl, C-amido, N-amido, S-sulfonamido, N-sulfonamido, C-carboxy, protected C-carboxy, O
  • C a to C b in which "a” and “b” are integers refer to the number of carbon atoms in an alkyl, alkenyl or alkynyl group, or the number of carbon atoms in the ring of a cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl or heteroalicyclyl group.
  • the alkyl, alkenyl, alkynyl, ring of the cycloalkyl, ring of the cycloalkenyl, ring of the cycloalkynyl, ring of the aryl, ring of the heteroaryl or ring of the heteroalicyclyl can contain from "a" to "b", inclusive, carbon atoms.
  • a "C 1 to C 4 alkyl” group refers to all alkyl groups having from 1 to 4 carbons, that is, CH 3 -, CH 3 CH 2 -, CH 3 CH 2 CH 2 -, (CH 3 ) 2 CH-, CH 3 CH 2 CH 2 CH 2 -, CH 3 CH 2 CH(CH 3 )- and (CH 3 ) 3 C-. If no "a” and "b” are designated with regard to an alkyl, alkenyl, alkynyl, cycloalkyl cycloalkenyl, cycloalkynyl, aryl, heteroaryl or heteroalicyclyl group, the broadest range described in these definitions is to be assumed.
  • alkyl refers to a straight or branched hydrocarbon chain that comprises a fully saturated (no double or triple bonds) hydrocarbon group.
  • the alkyl group may have 1 to 20 carbon atoms (whenever it appears herein, a numerical range such as “1 to 20” refers to each integer in the given range; e.g., "1 to 20 carbon atoms” means that the alkyl group may consist of 1 carbon atom, 2 carbon atoms, 3 carbon atoms, etc., up to and including 20 carbon atoms, although the present definition also covers the occurrence of the term "alkyl” where no numerical range is designated).
  • the alkyl group may also be a medium size alkyl having 1 to 10 carbon atoms.
  • the alkyl group could also be a lower alkyl having 1 to 6 carbon atoms.
  • the alkyl group of the compounds may be designated as "C 1 -C 4 alkyl” or similar designations.
  • “C 1 -C 4 alkyl” indicates that there are one to four carbon atoms in the alkyl chain, i.e., the alkyl chain is selected from methyl, ethyl, propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, and t-butyl.
  • Typical alkyl groups include, but are in no way limited to, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tertiary butyl, pentyl and hexyl.
  • the alkyl group may be substituted or unsubstituted.
  • alkenyl refers to an alkyl group that contains in the straight or branched hydrocarbon chain one or more double bonds.
  • An alkenyl group may be unsubstituted or substituted.
  • alkynyl refers to an alkyl group that contains in the straight or branched hydrocarbon chain one or more triple bonds.
  • An alkynyl group may be unsubstituted or substituted.
  • cycloalkyl refers to a completely saturated (no double or triple bonds) mono- or multi- cyclic hydrocarbon ring system. When composed of two or more rings, the rings may be joined together in a fused fashion. Cycloalkyl groups can contain 3 to 10 atoms in the ring(s) or 3 to 8 atoms in the ring(s). A cycloalkyl group may be unsubstituted or substituted. Typical cycloalkyl groups include, but are in no way limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cyclooctyl.
  • cycloalkenyl refers to a mono- or multi- cyclic hydrocarbon ring system that contains one or more double bonds in at least one ring; although, if there is more than one, the double bonds cannot form a fully delocalized pi-electron system throughout all the rings (otherwise the group would be "aryl,” as defined herein). When composed of two or more rings, the rings may be connected together in a fused fashion. A cycloalkenyl group may be unsubstituted or substituted.
  • cycloalkynyl refers to a mono- or multi- cyclic hydrocarbon ring system that contains one or more triple bonds in at least one ring. If there is more than one triple bond, the triple bonds cannot form a fully delocalized pi-electron system throughout all the rings. When composed of two or more rings, the rings may be joined together in a fused fashion. A cycloalkynyl group may be unsubstituted or substituted.
  • aryl refers to a carbocyclic (all carbon) monocyclic or multicyclic aromatic ring system (including fused ring systems where two carbocyclic rings share a chemical bond) that has a fully delocalized pi-electron system throughout all the rings.
  • the number of carbon atoms in an aryl group can vary.
  • the aryl group can be a C 6 -C 14 aryl group, a C 6 -C 10 aryl group, or a C 6 aryl group.
  • Examples of aryl groups include, but are not limited to, benzene, naphthalene and azulene.
  • An aryl group may be substituted or unsubstituted.
  • heteroaryl refers to a monocyclic or multicyclic aromatic ring system (a ring system with fully delocalized pi-electron system) that contain(s) one or more heteroatoms, that is, an element other than carbon, including but not limited to, nitrogen, oxygen and sulfur.
  • the number of atoms in the ring(s) of a heteroaryl group can vary.
  • the heteroaryl group can contain 4 to 14 atoms in the ring(s), 5 to 10 atoms in the ring(s) or 5 to 6 atoms in the ring(s).
  • heteroaryl includes fused ring systems where two rings, such as at least one aryl ring and at least one heteroaryl ring, or at least two heteroaryl rings, share at least one chemical bond.
  • heteroaryl rings include, but are not limited to, furan, furazan, thiophene, benzothiophene, phthalazine, pyrrole, oxazole, benzoxazole, 1,2,3-oxadiazole, 1,2,4-oxadiazole, thiazole, 1,2,3-thiadiazole, 1,2,4-thiadiazole, benzothiazole, imidazole, benzimidazole, indole, indazole, pyrazole, benzopyrazole, isoxazole, benzoisoxazole, isothiazole, triazole, benzotriazole, thiadiazole, tetrazole, pyridine, pyridazine, pyrimidine
  • heterocyclyl or “heteroalicyclyl” refers to three-, four-, five-, six-, seven-, eight-, nine-, ten-, up to 18-membered monocyclic, bicyclic, and tricyclic ring system wherein carbon atoms together with from 1 to 5 heteroatoms constitute said ring system.
  • a heterocycle may optionally contain one or more unsaturated bonds situated in such a way, however, that a fully delocalized pi-electron system does not occur throughout all the rings.
  • the heteroatom(s) is an element other than carbon including, but not limited to, oxygen, sulfur, and nitrogen.
  • a heterocycle may further contain one or more carbonyl or thiocarbonyl functionalities, so as to make the definition include oxo-systems and thio-systems such as lactams, lactones, cyclic imides, cyclic thioimides and cyclic carbamates. When composed of two or more rings, the rings may be joined together in a fused fashion. Additionally, any nitrogens in a heteroalicyclic may be quaternized. Heterocyclyl or heteroalicyclic groups may be unsubstituted or substituted.
  • heterocyclyl or “heteroalicyclyl” groups include but are not limited to, 1,3-dioxin, 1,3-dioxane, 1,4-dioxane, 1,2-dioxolane, 1,3-dioxolane, 1,4-dioxolane, 1,3-oxathiane, 1,4-oxathiin, 1,3-oxathiolane, 1,3-dithiole, 1,3-dithiolane, 1,4-oxathiane, tetrahydro-1,4-thiazine, 2H-1,2-oxazine, maleimide, succinimide, barbituric acid, thiobarbituric acid, dioxopiperazine, hydantoin, dihydrouracil, trioxane, hexahydro-1,3,5-triazine, imidazoline, imidazolidine, isoxazoline, isoxazol
  • aralkyl and “aryl(alkyl)” refer to an aryl group connected, as a substituent, via a lower alkylene group.
  • the lower alkylene and aryl group of an aralkyl may be substituted or unsubstituted. Examples include but are not limited to benzyl, 2-phenylalkyl, 3-phenylalkyl, and naphthylalkyl.
  • heteroarylkyl and “heteroaryl(alkyl)” refer to a heteroaryl group connected, as a substituent, via a lower alkylene group.
  • the lower alkylene and heteroaryl group of heteroaralkyl may be substituted or unsubstituted. Examples include but are not limited to 2-thienylalkyl, 3-thienylalkyl, furylalkyl, thienylalkyl, pyrrolylalkyl, pyridylalkyl, isoxazolylalkyl, imidazolylalkyl, and their benzo-fused analogs.
  • a “(heteroalicyclyl)alkyl” and “(heterocyclyl)alkyl” refer to a heterocyclic or a heteroalicyclylic group connected, as a substituent, via a lower alkylene group.
  • the lower alkylene and heterocyclyl of a (heteroalicyclyl)alkyl may be substituted or unsubstituted. Examples include but are not limited tetrahydro-2H-pyran-4-yl)methyl, (piperidin-4-yl)ethyl, (piperidin-4-yl)propyl, (tetrahydro-2H-thiopyran-4-yl)methyl, and (1,3-thiazinan-4-yl)methyl.
  • Lower alkylene groups are straight-chained -CH 2 - tethering groups, forming bonds to connect molecular fragments via their terminal carbon atoms. Examples include but are not limited to methylene (-CH 2 -), ethylene (-CH 2 CH 2 -), propylene (-CH 2 CH 2 CH 2 -), and butylene (-CH 2 CH 2 CH 2 CH 2 -).
  • a lower alkylene group can be substituted by replacing one or more hydrogen of the lower alkylene group with a substituent(s) listed under the definition of "substituted.”
  • alkoxy refers to the formula -OR wherein R is an alkyl, an alkenyl, an alkynyl, a cycloalkyl, a cycloalkenyl, a cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, (heteroaryl)alkyl or (heteroalicyclyl)alkyl is defined herein.
  • a non-limiting list of alkoxys are methoxy, ethoxy, n-propoxy, 1-methylethoxy (isopropoxy), n-butoxy, iso-butoxy, sec-butoxy, tert-butoxy, phenoxy and benzoxy.
  • An alkoxy may be substituted or unsubstituted.
  • acyl refers to a hydrogen, alkyl, alkenyl, alkynyl, or aryl connected, as substituents, via a carbonyl group. Examples include formyl, acetyl, propanoyl, benzoyl, and acryl. An acyl may be substituted or unsubstituted.
  • hydroxyalkyl refers to an alkyl group in which one or more of the hydrogen atoms are replaced by a hydroxy group.
  • exemplary hydroxyalkyl groups include but are not limited to, 2-hydroxyethyl, 3-hydroxypropyl, 2-hydroxypropyl, and 2,2-dihydroxyethyl.
  • a hydroxyalkyl may be substituted or unsubstituted.
  • haloalkyl refers to an alkyl group in which one or more of the hydrogen atoms are replaced by a halogen (e.g., mono-haloalkyl, di-haloalkyl and trihaloalkyl).
  • a halogen e.g., mono-haloalkyl, di-haloalkyl and trihaloalkyl.
  • groups include but are not limited to, chloromethyl, fluoromethyl, difluoromethyl, trifluoromethyl, 1-chloro-2-fluoromethyl and 2-fluoroisobutyl.
  • a haloalkyl may be substituted or unsubstituted.
  • haloalkoxy refers to an alkoxy group in which one or more of the hydrogen atoms are replaced by a halogen (e.g., mono-haloalkoxy, di- haloalkoxy and trihaloalkoxy).
  • a halogen e.g., mono-haloalkoxy, di- haloalkoxy and trihaloalkoxy.
  • groups include but are not limited to, chloromethoxy, fluoromethoxy, difluoromethoxy, trifluoromethoxy, 1-chloro-2-fluoromethoxy and 2-fluoroisobutoxy.
  • a haloalkoxy may be substituted or unsubstituted.
  • arylthio refers to RS-, in which R is an aryl, such as, but not limited to, phenyl.
  • R is an aryl, such as, but not limited to, phenyl.
  • An arylthio may be substituted or unsubstituted.
  • a “sulfenyl” group refers to an "-SR" group in which R can be hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, (heteroaryl)alkyl or (heteroalicyclyl)alkyl.
  • R can be hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, (heteroaryl)alkyl or (heteroalicyclyl)alkyl.
  • a sulfenyl may be substituted or unsubstituted.
  • a sulfinyl may be substituted or unsubstituted.
  • a “sulfonyl” group refers to an “SO 2 R" group in which R can be the same as defined with respect to sulfenyl.
  • a sulfonyl may be substituted or unsubstituted.
  • R can be hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, (heteroaryl)alkyl or (heteroalicyclyl)alkyl, as defined herein.
  • An O-carboxy may be substituted or unsubstituted.
  • An ester and C-carboxy may be substituted or unsubstituted.
  • a thiocarbonyl may be substituted or unsubstituted.
  • a “trihalomethanesulfonyl” group refers to an "X 3 CSO 2 -" group wherein each X is a halogen.
  • a “trihalomethanesulfonamido” group refers to an "X 3 CS(O) 2 N(R A )-" group wherein each X is a halogen, and R A hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, (heteroaryl)alkyl or (heteroalicyclyl)alkyl.
  • amino refers to a -NH 2 group.
  • hydroxy refers to a -OH group.
  • a “cyano” group refers to a "-CN” group.
  • azido refers to a -N 3 group.
  • An “isocyanato” group refers to a "-NCO” group.
  • a “thiocyanato” group refers to a "-CNS” group.
  • An “isothiocyanato” group refers to an “-NCS” group.
  • a “mercapto” group refers to an "-SH” group.
  • S-sulfonamido refers to a "-SO 2 N(R A R B )" group in which R A and R B can be independently hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, (heteroaryl)alkyl or (heteroalicyclyl)alkyl.
  • An S-sulfonamido may be substituted or unsubstituted.
  • N-sulfonamido refers to a "RSO 2 N(R A )-" group in which R and R A can be independently hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, (heteroaryl)alkyl or (heteroalicyclyl)alkyl.
  • An N-sulfonamido may be substituted or unsubstituted.
  • An O-carbamyl may be substituted or unsubstituted.
  • An N-carbamyl may be substituted or unsubstituted.
  • An O-thiocarbamyl may be substituted or unsubstituted.
  • An N-thiocarbamyl may be substituted or unsubstituted.
  • a C-amido may be substituted or unsubstituted.
  • R and R A can be independently hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalicyclyl, aralkyl, (heteroaryl)alkyl or (heteroalicyclyl)alkyl.
  • An N-amido may be substituted or unsubstituted.
  • halogen atom or "halogen” as used herein, means any one of the radio-stable atoms of column 7 of the Periodic Table of the Elements, such as, fluorine, chlorine, bromine and iodine.
  • substituents there may be one or more substituents present.
  • haloalkyl may include one or more of the same or different halogens.
  • C 1 -C 3 alkoxyphenyl may include one or more of the same or different alkoxy groups containing one, two or three atoms.
  • nucleoside is used herein in its ordinary sense as understood by those skilled in the art, and refers to a compound composed of an optionally substituted pentose moiety or modified pentose moiety attached to a heterocyclic base or tautomer thereof via a N-glycosidic bond, such as attached via the 9-position of a purine-base or the 1-position of a pyrimidine-base.
  • examples include, but are not limited to, a ribonucleoside comprising a ribose moiety and a deoxyribonucleoside comprising a deoxyribose moiety.
  • a modified pentose moiety is a pentose moiety in which an oxygen atom has been replaced with a carbon and/or a carbon has been replaced with a sulfur or an oxygen atom.
  • a "nucleoside” is a monomer that can have a substituted base and/or sugar moiety. Additionally, a nucleoside can be incorporated into larger DNA and/or RNA polymers and oligomers. In some instances, the nucleoside can be a nucleoside analog drug.
  • nucleotide is used herein in its ordinary sense as understood by those skilled in the art, and refers to a nucleoside having a phosphate ester bound to the pentose moiety, for example, at the 5'-position.
  • heterocyclic base refers to an optionally substituted nitrogen-containing heterocyclyl that can be attached to an optionally substituted pentose moiety or modified pentose moiety.
  • the heterocyclic base can be selected from an optionally substituted purine-base, an optionally substituted pyrimidine-base and an optionally substituted triazole-base (for example, a 1,2,4-triazole).
  • purine-base is used herein in its ordinary sense as understood by those skilled in the art, and includes its tautomers.
  • pyrimidine-base is used herein in its ordinary sense as understood by those skilled in the art, and includes its tautomers.
  • a non-limiting list of optionally substituted purine-bases includes purine, adenine, guanine, hypoxanthine, xanthine, alloxanthine, 7-alkylguanine (e.g. 7-methylguanine), theobromine, caffeine, uric acid and isoguanine.
  • pyrimidine-bases include, but are not limited to, cytosine, thymine, uracil, 5,6-dihydrouracil and 5-alkylcytosine (e.g., 5-methylcytosine).
  • An example of an optionally substituted triazole-base is 1,2,4-triazole-3-carboxamide.
  • heterocyclic bases include diaminopurine, 8-oxo-N 6 -alkyladenine (e.g., 8-oxo-N 6 -methyladenine), 7-deazaxanthine, 7-deazaguanine, 7-deazaadenine, N 4 ,N 4 -ethanocytosin, N 6 ,N 6 -ethano-2,6-diaminopurine, 5-halouracil (e.g., 5-fluorouracil and 5-bromouracil), pseudoisocytosine, isocytosine, isoguanine, and other heterocyclic bases described in U.S. Patent Nos.
  • a heterocyclic base can be optionally substituted with an amine or an enol protecting group(s).
  • N-linked amino acid refers to an amino acid that is attached to the indicated moiety via a main-chain amino or mono-substituted amino group.
  • amino acid is attached in an -N-linked amino acid, one of the hydrogens that is part of the main-chain amino or mono-substituted amino group is not present and the amino acid is attached via the nitrogen.
  • N-linked amino acids can be substituted or unsubstituted.
  • ester derivative refers to an amino acid in which a main-chain carboxylic acid group has been converted to an ester group.
  • -O-linked amino acid refers to an amino acid that is attached to the indicated moiety via the hydroxy from its main-chain carboxylic acid group.
  • the amino acid is attached in an -O-linked amino acid, the hydrogen that is part of the hydroxy from its main-chain carboxylic acid group is not present and the amino acid is attached via the oxygen.
  • O-linked amino acids can be substituted or unsubstituted.
  • amino acid refers to any amino acid (both standard and non-standard amino acids), including, but not limited to, ⁇ -amino acids, ⁇ -amino acids, ⁇ -amino acids and ⁇ -amino acids.
  • suitable amino acids include, but are not limited to, alanine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine, tyrosine, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.
  • suitable amino acids include, but are not limited to, ornithine, hypusine, 2-aminoisobutyric acid, dehydroalanine, gamma-aminobutyric acid, citrulline, beta-alanine, alpha-ethyl-glycine, alpha-propyl-glycine and norleucine.
  • phosphorothioate and “phosphothioate” refer to a compound of the general formula its protonated forms (for example, and ) and its tautomers (such as ).
  • phosphate is used in its ordinary sense as understood by those skilled in the art, and includes its protonated forms (for example, ).
  • diphosphate diphosphate
  • triphosphate triphosphate
  • protecting group and “protecting groups” as used herein refer to any atom or group of atoms that is added to a molecule in order to prevent existing groups in the molecule from undergoing unwanted chemical reactions.
  • Examples of protecting group moieties are described in T. W. Greene and P. G. M. Wuts, Protective Groups in Organic Synthesis, 3. Ed. John Wiley & Sons, 1999 , and in J.F.W. McOmie, Protective Groups in Organic Chemistry Plenum Press, 1973 , both of which are hereby incorporated by reference for the limited purpose of disclosing suitable protecting groups.
  • the protecting group moiety may be chosen in such a way, that they are stable to certain reaction conditions and readily removed at a convenient stage using methodology known from the art.
  • a non-limiting list of protecting groups include benzyl; substituted benzyl; alkylcarbonyls and alkoxycarbonyls (e.g., t-butoxycarbonyl (BOC), acetyl, or isobutyryl); arylalkylcarbonyls and arylalkoxycarbonyls (e.g., benzyloxycarbonyl); substituted methyl ether (e.g.
  • methoxymethyl ether substituted ethyl ether; a substituted benzyl ether; tetrahydropyranyl ether; silyls (e.g., trimethylsilyl, triethylsilyl, triisopropylsilyl, t-butyldimethylsilyl, tri- iso -propylsilyloxymethyl, [2-(trimethylsilyl)ethoxy]methyl or t-butyldiphenylsilyl); esters (e.g. benzoate ester); carbonates (e.g. methoxymethylcarbonate); sulfonates (e.g. tosylate or mesylate); acyclic ketal (e.g.
  • cyclic ketals e.g., 1,3-dioxane, 1,3-dioxolanes, and those described herein
  • acyclic acetal e.g., those described herein
  • acyclic hemiacetal e.g., 1,3-dithiane or 1,3-dithiolane
  • orthoesters e.g., those described herein
  • triarylmethyl groups e.g., trityl; monomethoxytrityl (MMTr); 4,4'-dimethoxytrityl (DMTr); 4,4',4"-trimethoxytrityl (TMTr); and those described herein).
  • pharmaceutically acceptable salt refers to a salt of a compound that does not cause significant irritation to an organism to which it is administered and does not abrogate the biological activity and properties of the compound.
  • the salt is an acid addition salt of the compound.
  • Pharmaceutical salts can be obtained by reacting a compound with inorganic acids such as hydrohalic acid (e.g., hydrochloric acid or hydrobromic acid), sulfuric acid, nitric acid and phosphoric acid.
  • compositions can also be obtained by reacting a compound with an organic acid such as aliphatic or aromatic carboxylic or sulfonic acids, for example formic, acetic, succinic, lactic, malic, tartaric, citric, ascorbic, nicotinic, methanesulfonic, ethanesulfonic, p-toluensulfonic, salicylic or naphthalenesulfonic acid.
  • organic acid such as aliphatic or aromatic carboxylic or sulfonic acids
  • Pharmaceutical salts can also be obtained by reacting a compound with a base to form a salt such as an ammonium salt, an alkali metal salt, such as a sodium or a potassium salt, an alkaline earth metal salt, such as a calcium or a magnesium salt, a salt of organic bases such as dicyclohexylamine, N-methyl-D-glucamine, tris(hydroxymethyl)methylamine, C 1 -C 7 alkylamine, cyclohexylamine, triethanolamine, ethylenediamine, and salts with amino acids such as arginine and lysine.
  • a salt such as an ammonium salt, an alkali metal salt, such as a sodium or a potassium salt, an alkaline earth metal salt, such as a calcium or a magnesium salt, a salt of organic bases such as dicyclohexylamine, N-methyl-D-glucamine, tris(hydroxymethyl)methylamine, C 1 -C 7 alkylamine, cyclohexy
  • the term “comprising” is to be interpreted synonymously with the phrases “having at least” or “including at least”.
  • the term “comprising” means that the process includes at least the recited steps, but may include additional steps.
  • the term “comprising” means that the compound, composition or device includes at least the recited features or components, but may also include additional features or components.
  • a group of items linked with the conjunction 'and' should not be read as requiring that each and every one of those items be present in the grouping, but rather should be read as 'and/or' unless expressly stated otherwise.
  • a group of items linked with the conjunction 'or' should not be read as requiring mutual exclusivity among that group, but rather should be read as 'and/or' unless expressly stated otherwise.
  • each center may independently be of R-configuration or S-configuration or a mixture thereof.
  • the compounds provided herein may be enantiomerically pure, enantiomerically enriched, racemic mixture, diastereomerically pure, diastereomerically enriched, or a stereoisomeric mixture.
  • each double bond may independently be E or Z a mixture thereof.
  • valencies are to be filled with hydrogens or isotopes thereof, e.g., hydrogen-1 (protium) and hydrogen-2 (deuterium).
  • each chemical element as represented in a compound structure may include any isotope of said element.
  • a hydrogen atom may be explicitly disclosed or understood to be present in the compound.
  • the hydrogen atom can be any isotope of hydrogen, including but not limited to hydrogen-1 (protium) and hydrogen-2 (deuterium).
  • reference herein to a compound encompasses all potential isotopic forms unless the context clearly dictates otherwise.
  • the methods and combinations described herein include crystalline forms (also known as polymorphs, which include the different crystal packing arrangements of the same elemental composition of a compound), amorphous phases, salts, solvates, and hydrates.
  • the compounds described herein exist in solvated forms with pharmaceutically acceptable solvents such as water, ethanol, or the like.
  • the compounds described herein exist in unsolvated form.
  • Solvates contain either stoichiometric or non-stoichiometric amounts of a solvent, and may be formed during the process of crystallization with pharmaceutically acceptable solvents such as water, ethanol, or the like. Hydrates are formed when the solvent is water, or alcoholates are formed when the solvent is alcohol.
  • the compounds provided herein can exist in unsolvated as well as solvated forms. In general, the solvated forms are considered equivalent to the unsolvated forms for the purposes of the compounds and methods provided herein.
  • B 1A , B 1B and B 1C can be independently an optionally substituted heterocyclic base or an optionally substituted heterocyclic base with a protected amino group;
  • R 1A can be selected from hydrogen, an optionally substituted acyl, an optionally substituted O-linked amino acid, when the dashed line (------) of Formula (I) is a single bond,
  • R 2A can be CH 2 , and
  • R 3A can be O (oxygen); when the dashed line (------) of Formula (I) is absent, R 2A can be selected from an optionally substituted C 1-6 alkyl, an optionally substituted C 2-6 alkenyl, an optionally substituted C 2-6 alkynyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted -O-C 1-6 alkyl, an optionally substituted O
  • the compound can be a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein: B 1A can be an optionally substituted heterocyclic base or an optionally substituted heterocyclic base with a protected amino group; R 1A can be selected from hydrogen, when the dashed line (------) of Formula (I) is a single bond, R 2A is CH 2 , and R 3A is O (oxygen); when the dashed line (------) of Formula (I) is absent, R 2A can be selected from an optionally substituted C 1-6 alkyl, an optionally substituted C 2-6 alkenyl, an optionally substituted C 2-6 alkynyl, an optionally substituted -O-C 1-6 alkyl, an optionally substituted -O-C 3-6 alkenyl, an optionally substituted -O-C 3-6 alkynyl and cyano, and R 3A is OH; R 4A can be a halogen; R 5A can be hydrogen or halogen; R 5
  • R 9A can be independently selected from an optionally substituted C 1-24 alkyl, an optionally substituted C 2-24 alkenyl, an optionally substituted C 2-24 alkynyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 3-6 cycloalkenyl, NR 30A R 31A , an optionally substituted N-linked amino acid and an optionally substituted N-linked amino acid ester derivative; R 10A and R 11A can be independently an optionally substituted N-linked amino acid or an optionally substituted N-linked amino acid ester derivative; R 12A , R 13A and R 14A can be independently absent or hydrogen; each R 15A , each R 16A , each R 17A and each R 18A can be independently hydrogen, an optionally substituted C 1-24 alkyl or alkoxy; R 19A , R 20A , R 22A and R 23A can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl and an optionally substituted aryl; R
  • a compound of Formula (I) can have a structure shown herein, provided that when the dashed line (------) of Formula (I) is absent;
  • R 1A is wherein R 8A is an unsubstituted C 1-4 alkyl or phenyl optionally para-substituted with a halogen or methyl and
  • R 9A is methyl ester, ethyl ester, isopropyl ester, n-butyl ester, benzyl ester or phenyl ester of an amino acid selected from glycine, alanine, valine, leucine, phenylalanine, tryptophan, methionine and proline;
  • R 3A is OH;
  • R 4A is fluoro;
  • R 5A is fluoro or hydrogen;
  • B 1A is an unsubstituted uracil; then R 2A cannot be -OCH 3 ; provided that when the dashed line (------) of Formula
  • R 1A can be In some embodiments, R 6A and R 7A can be both hydrogen. In other embodiments, R 6A and R 7A can be both absent. In still other embodiments, at least one R 6A and R 7A can be absent. In yet still other embodiments, at least one R 6A and R 7A can be hydrogen. Those skilled in the art understand that when R 6A and/or R 7A are absent, the associated oxygen(s) will have a negative charge. For example, when R 6A is absent, the oxygen associated with R 6A will have a negative charge. In some embodiments, Z 1A can be O (oxygen). In other embodiments, Z 1A can be S (sulfur). In some embodiments, R 1A can be a monophosphate. In other embodiments, R 1A can be a monothiophosphate.
  • R 1A when R 1A is one of R 6A and R 7A can be hydrogen, and the other of R 6A and R 7A is selected from an optionally substituted C 1-24 alkyl, an optionally substituted C 2-24 alkenyl, an optionally substituted C 2-24 alkynyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 3-6 cycloalkenyl, an optionally substituted aryl, an optionally substituted heteroaryl and an optionally substituted aryl(C 1-6 alkyl).
  • one of R 6A and R 7A can be hydrogen, and the other of R 6A and R 7A can be an optionally substituted C 1-24 alkyl.
  • both R 6A and R 7A can be independently selected from an optionally substituted C 1-24 alkyl, an optionally substituted C 2-24 alkenyl, an optionally substituted C 2-24 alkynyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 3-6 cycloalkenyl, an optionally substituted aryl, an optionally substituted heteroaryl and an optionally substituted aryl(C 1-6 alkyl).
  • both R 6A and R 7A can be an optionally substituted C 1-24 alkyl.
  • both R 6A and R 7A can be an optionally substituted C 2-24 alkenyl.
  • R 6A and R 7A can be independently an optionally substituted version of the following: myristoleyl, myristyl, palmitoleyl, palmityl, sapienyl, oleyl, elaidyl, vaccenyl, linoleyl, ⁇ -linolenyl, arachidonyl, eicosapentaenyl, erucyl, docosahexaenyl, caprylyl, capryl, lauryl, stearyl, arachidyl, behenyl, lignoceryl, and cerotyl.
  • At least one of R 6A and R 7A can be *-(CR 15A R 16A ) p -O-C 1-24 alkyl. In other embodiments, R 6A and R 7A can be both *-(CR 15A R 16A ) p -O-C 1-24 alkyl. In some embodiments, each R 15A and each R 16A are hydrogen. In other embodiments, at least one of R 15A and R 16A is an optionally substituted C 1-24 alkyl. In other embodiments, at least one of R 15A and R 16A is an alkoxy (for example, benzoxy). In some embodiments, p can be 1. In other embodiments, p can be 2. In still other embodiments, p can be 3.
  • R 6A and R 7A can be *-(CR 17A R 18A ) q -O-C 2-24 alkenyl. In other embodiments, R 6A and R 7A can be both *-(CR 17A R 18A ) q -O-C 2-24 alkenyl. In some embodiments, each R 17A and each R 18A are hydrogen. In other embodiments, at least one of R 17A and R 18A is an optionally substituted C 1-24 alkyl. In some embodiments, q can be 1. In other embodiments, q can be 2. In still other embodiments, q can be 3.
  • the C 1-24 alkyl can be selected from caprylyl, capryl, lauryl, myristyl, palmityl, stearyl, arachidyl, behenyl, lignoceryl, and cerotyl
  • the C 2-24 alkenyl can be selected from myristoleyl, palmitoleyl, sapienyl, oleyl, elaidyl, vaccenyl, linoleyl, ⁇ -linolenyl, arachidonyl, eicosapentaenyl, erucyl and docosahexaenyl.
  • R 1A is at least one of R 6A and R 7A can be selected from and and the other of R 6A and R 7A can be selected from absent, hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted C 2-24 alkenyl, an optionally substituted C 2-24 alkynyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 3-6 cycloalkenyl, an optionally substituted aryl, an optionally substituted heteroaryl and an optionally substituted aryl(C 1-6 alkyl).
  • R 6A and R 7A can be or In some embodiments, both R 6A and R 7A can be
  • R 19A and R 20A can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl and an optionally substituted aryl
  • R 21A can be selected from hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted aryl, an optionally substituted -O-C 1-24 alkyl and an optionally substituted -O-aryl.
  • R 19A and R 20A can be hydrogen.
  • R 19A and R 20A can be an optionally substituted C 1-24 alkyl or an optionally substituted aryl.
  • R 21A can be an optionally substituted C 1-24 alkyl.
  • R 21A can be an optionally substituted aryl.
  • R 21A can be an optionally substituted -O-C 1-24 alkyl or an optionally substituted -O-aryl.
  • both R 6A and R 7A can be When one or both of R 6A and R 7A are R 22A and R 23A can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl and an optionally substituted aryl; R 24A can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted aryl, an optionally substituted -O-C 1-24 alkyl and an optionally substituted -O-aryl; and Z 4A can be independently O (oxygen) or S (sulfur). In some embodiments, R 22A and R 23A can be hydrogen.
  • R 22A and R 23A can be an optionally substituted C 1-24 alkyl or an optionally substituted aryl.
  • R 24A can be an optionally substituted C 1-24 alkyl.
  • R 24A can be an optionally substituted aryl.
  • R 24A can be an optionally substituted -O-C 1-24 alkyl or an optionally substituted -O-aryl.
  • Z 4A can be O (oxygen).
  • Z 4A can be or S (sulfur).
  • one or both of R 6A and R 7A can be isopropylcarbonyloxymethyl.
  • one or both of R 6A and R 7A can be pivaloyloxymethyl.
  • both R 6A and R 7A can be When one or both of R 6A and R 7A are R 26A and R 27A can be independently -C ⁇ N or an optionally substituted substituent selected from C 2-8 organylcarbonyl, C 2-8 alkoxycarbonyl and C 2-8 organylaminocarbonyl; R 28A can be selected from hydrogen, an optionally substituted C 1-24 -alkyl, an optionally substituted C 2-24 alkenyl, an optionally substituted C 2-24 alkynyl, an optionally substituted C 3-6 cycloalkyl and an optionally substituted C 3-6 cycloalkenyl; and r can be 1 or 2.
  • R 28A can be an optionally substituted C 1-4 -alkyl.
  • R 28A can be methyl or tert-butyl.
  • r can be 1. In other embodiments, r can be 2.
  • Example of include, but are not limited to the following:
  • R 6A and R 7A can be both an optionally substituted aryl. In some embodiments, at least one of R 6A and R 7A can be an optionally substituted aryl. For example, both R 6A and R 7A can be an optionally substituted phenyl or an optionally substituted naphthyl. When substituted, the substituted aryl can be substituted with 1, 2, 3 or more than 3 substituents. When more the two substituents are present, the substituents can be the same or different. In some embodiments, when at least one of R 6A and R 7A is a substituted phenyl, the substituted phenyl can be a para-, ortho- or meta-substituted phenyl.
  • R 6A and R 7A can be both an optionally substituted aryl(C 1-6 alkyl). In some embodiments, at least one of R 6A and R 7A can be an optionally substituted aryl(C 1-6 alkyl). For example, both R 6A and R 7A can be an optionally substituted benzyl. When substituted, the substituted benzyl group can be substituted with 1, 2, 3 or more than 3 substituents. When more the two substituents are present, the substituents can be the same or different. In some embodiments, the aryl group of the aryl(C 1-6 alkyl) can be a para-, ortho- or meta-substituted phenyl.
  • R 6A and R 7A can be both In some embodiments, at least one of R 6A and R 7A can be In some embodiments, R 25A can be hydrogen. In other embodiments, R 25A can be an optionally substituted C 1-24 alkyl. In still other embodiments, R 25A can be an optionally substituted aryl. In some embodiments, R 25A can be a C 1-6 alkyl, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 6A and R 7A can be both In some embodiments, at least one of R 6A and R 7A can be In some embodiments, R 29A can be hydrogen. In other embodiments, R 29A can be an optionally substituted C 1-24 alkyl. In some embodiments, R 29A can be a C 1-4 alkyl, such as methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl and t-butyl. In still other embodiments, R 29A can be an optionally substituted aryl, such as an optionally substituted phenyl or an optionally substituted naphthyl.
  • R 1A can be R 6A can be R 7A can be absent or hydrogen; R 12A , R 13A and R 14A can be independently absent or hydrogen; and m can be 0 or 1.
  • m can be 0, and R 7A , R 12A and R 13A can be independently absent or hydrogen.
  • m can be 1, and R 7A , R 12A , R 13A and R 14A can be independently absent or hydrogen.
  • R 6A can be diphosphate, when Z 1A is oxygen, or an alpha-thiodiphosphate, when Z 1A is sulfur.
  • R 6A when m is 1, R 6A can be triphosphate, when Z 1A is oxygen, or an alpha-thiotriphosphate, when Z 1A is sulfur.
  • R 6A and R 7A can be taken together to form an optionally substituted
  • R 1A can be an optionally substituted
  • the ring can be substituted 1, 2, 3 or 3 or more times. When substituted with multiple substituents, the substituents can be the same or different.
  • R 1A when R 1A is the ring can be substituted with an optionally substituted aryl group and/or an optionally substituted heteroaryl.
  • An example of a suitable heteroaryl is pyridinyl.
  • R 6A and R 7A can be taken together to form an optionally substituted such as wherein R 32A can be an optionally substituted aryl, an optionally substituted heteroaryl or an optionally substituted heterocyclyl.
  • R 6A and R 7A can be taken together to form an optionally substituted wherein the oxygens connected to R 6A and R 7A , the phosphorus and the moiety form a six-membered to ten-membered ring system.
  • Example of an optionally substituted include
  • R 6A and R 7A can be the same. In some embodiments, R 6A and R 7A can be the different.
  • Z 1A can be oxygen. In other embodiments, Z 1A can be sulfur.
  • R 1A can be In some embodiments, R 8A can be selected from absent, hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted C 2-24 alkenyl, an optionally substituted C 2-24 alkynyl, an optionally substituted C 3-6 cycloalkyl and an optionally substituted C 3-6 cycloalkenyl; and R 9A can be independently selected from an optionally substituted C 1-24 alkyl, an optionally substituted C 2-24 alkenyl, an optionally substituted C 2-24 alkynyl, an optionally substituted C 3-6 cycloalkyl and an optionally substituted C 3-6 cycloalkenyl.
  • R 8A can be hydrogen
  • R 9A can be an optionally substituted C 1-6 alkyl.
  • suitable C 1-6 alkyls include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 8A can be hydrogen
  • R 9A can be NR 30A R 31A , wherein R 30 and R 31 can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted C 2-24 alkenyl, an optionally substituted C 2-24 alkynyl, an optionally substituted C 3-6 cycloalkyl and an optionally substituted C 3-6 cycloalkenyl.
  • R 8A can be absent or hydrogen; and R 9A can be an optionally substituted N-linked amino acid or an optionally substituted N-linked amino acid ester derivative.
  • R 8A can be an optionally substituted aryl; and R 9A can be an optionally substituted N-linked amino acid or an optionally substituted N-linked amino acid ester derivative.
  • R 8A can be an optionally substituted heteroaryl; and R 9A can be an optionally substituted N-linked amino acid or an optionally substituted N-linked amino acid ester derivative.
  • R 9A can be selected from alanine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine, tyrosine, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine and ester derivatives thereof.
  • Examples of an optionally substituted N-linked amino acid ester derivatives include optionally substituted versions of the following: alanine isopropyl ester, alanine cyclohexyl ester, alanine neopentyl ester, valine isopropyl ester and leucine isopropyl ester.
  • R 9A can have the structure wherein R 33A can be selected from hydrogen, an optionally substituted C 1-6 -alkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted aryl, an optionally substituted aryl(C 1-6 alkyl) and an optionally substituted haloalkyl; R 34A can be selected from hydrogen, an optionally substituted C 16 alkyl, an optionally substituted C 16 haloalkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 6 aryl, an optionally substituted C 10 aryl and an optionally substituted aryl(C 1-6 alkyl); and R 35A can be hydrogen or an optionally substituted C 1-4 -alkyl; or R 34A and R 35A can be taken together to form an optionally substituted C 3-6 cycloalkyl.
  • R 34A When R 34A is substituted, R 34A can be substituted with one or more substituents selected from N-amido, mercapto, alkylthio, an optionally substituted aryl, hydroxy, an optionally substituted heteroaryl, O-carboxy, and amino.
  • R 34A can be an unsubstituted C 1-6 -alkyl, such as those described herein.
  • R 34A can be hydrogen.
  • R 34A can be methyl.
  • R 33A can be an optionally substituted C 1-6 alkyl.
  • optionally substituted C 1-6 -alkyls include optionally substituted variants of the following: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 33A can be methyl or isopropyl.
  • R 33A can be ethyl or neopentyl.
  • R 33A can be an optionally substituted C 3-6 cycloalkyl.
  • optionally substituted C 3-6 cycloalkyl examples include optionally substituted variants of the following: cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
  • R 33A can be an optionally substituted cyclohexyl.
  • R 33A can be an optionally substituted aryl, such as phenyl and naphthyl.
  • R 33A can be an optionally substituted aryl(C 1-6 alkyl).
  • R 33A can be an optionally substituted benzyl.
  • R 33A can be an optionally substituted C 1-6 haloalkyl, for example, CF 3 .
  • R 35A can be hydrogen. In other embodiments, R 35A can be an optionally substituted C 1-4 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl. In an embodiment, R 35A can be methyl. In some embodiments, R 34A and R 35A can be taken together to form an optionally substituted C 3-6 cycloalkyl. Examples of optionally substituted C 3-6 cycloalkyl include optionally substituted variants of the following: cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
  • the carbon to which R 34A and R 35A are attached may be a chiral center.
  • the carbon to which R 34A and R 35A are attached may be a (R)-chiral center.
  • the carbon to which R 34A and R 35A are attached may be a (S)-chiral center.
  • R 1A when R 1A is Z 2A can be O (oxygen). In other embodiments, when R 1A is Z 2A can be S (sulfur).
  • R 1A can be In some embodiments, R 10A and R 11A can be both an optionally substituted N-linked amino acid or an optionally substituted N-linked amino acid ester derivative. In some embodiments, R 10A and R 11A can be independently selected from alanine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine, tyrosine, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine and ester derivatives thereof.
  • R 10A and R 11A can be an optionally substituted version of the following: alanine isopropyl ester, alanine cyclohexyl ester, alanine neopentyl ester, valine isopropyl ester and leucine isopropyl ester.
  • R 10A and R 11A can independently have the structure wherein R 36A can be selected from hydrogen, an optionally substituted C 1-6 -alkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted aryl, an optionally substituted aryl(C 1-6 alkyl) and an optionally substituted haloalkyl; R 37A can be selected from hydrogen, an optionally substituted C 1-6 alkyl, an optionally substituted C 1-6 haloalkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 6 aryl, an optionally substituted C 10 aryl and an optionally substituted aryl(C 1-6 alkyl); and R 38A can be hydrogen or an optionally substituted C 1-4 -alkyl; or R 37A and R 38A can be taken together to form an optionally substituted C 3-6 cycloalkyl.
  • R 37A When R 37A is substituted, R 37A can be substituted with one or more substituents selected from N-amido, mercapto, alkylthio, an optionally substituted aryl, hydroxy, an optionally substituted heteroaryl, O-carboxy, and amino.
  • R 37A can be an unsubstituted C 1-6 -alkyl, such as those described herein.
  • R 37A can be hydrogen.
  • R 37A can be methyl.
  • R 36A can be an optionally substituted C 1-6 alkyl.
  • optionally substituted C 1-6 -alkyls include optionally substituted variants of the following: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 36A can be methyl or isopropyl.
  • R 36A can be ethyl or neopentyl.
  • R 36A can be an optionally substituted C 3-6 cycloalkyl.
  • optionally substituted C 3-6 cycloalkyl examples include optionally substituted variants of the following: cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
  • R 36A can be an optionally substituted cyclohexyl.
  • R 36A can be an optionally substituted aryl, such as phenyl and naphthyl.
  • R 36A can be an optionally substituted aryl(C 1-6 alkyl).
  • R 36A can be an optionally substituted benzyl.
  • R 36A can be an optionally substituted C 1-6 haloalkyl, for example, CF 3 .
  • R 38A can be hydrogen. In other embodiments, R 38A can be an optionally substituted C 1-4 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl. In an embodiment, R 38A can be methyl. In some embodiments, R 37A and R 38A can be taken together to form an optionally substituted C 3-6 cycloalkyl. Examples of optionally substituted C 3-6 cycloalkyl include optionally substituted variants of the following: cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
  • the carbon to which R 37A and R 38A are attached may be a chiral center.
  • the carbon to which R 37A and R 38A are attached may be a (R)-chiral center.
  • the carbon to which R 37A and R 38A are attached may be a (S)-chiral center.
  • Suitable groups include the following:
  • R 10A and R 11A can be the same. In some embodiments, R 10A and R 11A can be the different.
  • Z 3A can be O (oxygen). In other embodiments, Z 3A can be S (sulfur).
  • R 1A can be an optionally substituted O-linked amino acid.
  • suitable O-linked amino acids include alanine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine, tyrosine, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.
  • suitable amino acids include, but are not limited to, ornithine, hypusine, 2-aminoisobutyric acid, dehydroalanine, gamma-aminobutyric acid, citrulline, beta-alanine, alpha-ethyl-glycine, alpha-propyl-glycine and norleucine.
  • the O-linked amino acid can have the structure wherein R 40A can be selected from hydrogen, an optionally substituted C 1-6 alkyl, an optionally substituted C 1-6 haloalkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 6 aryl, an optionally substituted C 10 aryl and an optionally substituted aryl(C 1-6 alkyl); and R 41A can be hydrogen or an optionally substituted C 1-4 -alkyl; or R 40A and R 41A can be taken together to form an optionally substituted C 3-6 cycloalkyl.
  • R 1A is an optionally substituted O-linked amino acid
  • the oxygen of R 1A O- of Formula (I) is part of the optionally substituted O-linked amino acid.
  • R 1A is the oxygen indicated with "*" is the oxygen of R 1A O- of Formula (I).
  • R 40A When R 40A is substituted, R 40A can be substituted with one or more substituents selected from N-amido, mercapto, alkylthio, an optionally substituted aryl, hydroxy, an optionally substituted heteroaryl, O-carboxy, and amino.
  • R 40A can be an unsubstituted C 1-6 -alkyl, such as those described herein.
  • R 40A can be hydrogen.
  • R 40A can be methyl.
  • R 41A can be hydrogen.
  • R 41A can be an optionally substituted C 1-4 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl. In an embodiment, R 41A can be methyl.
  • the carbon to which R 40A and R 41A are attached may be a chiral center. In some embodiment, the carbon to which R 40A and R 41A are attached may be a (R)-chiral center. In other embodiments, the carbon to which R 40A and R 41A are attached may be a (S)-chiral center.
  • the dashed line (------) can be a single bond
  • R 2A can be CH 2
  • R 3A can be O (oxygen).
  • R 2A is CH 2
  • R 3A is O (oxygen)
  • a 4-membered ring is formed that includes the 4'-carbon and 3'-carbon of the pentose ring.
  • R 2A can be selected from an optionally substituted C 1-6 alkyl, an optionally substituted C 2-6 alkenyl, an optionally substituted C 2-6 alkynyl, an optionally substituted -O-C 1-6 alkyl, an optionally substituted -O-C 3-6 alkenyl, an optionally substituted -O-C 3-6 alkynyl and cyano
  • R 2A can be an optionally substituted C 1-6 alkyl.
  • suitable C 1-6 alkyls include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 2A can be an unsubstituted C 1-6 alkyl. In other embodiments, R 2A can be a substituted C 1-6 alkyl.
  • R 2A can be a halogen substituted C 1-6 alkyl, a hydroxy substituted C 1-6 alkyl, an alkoxy substituted C 1-6 alkyl or a sulfenyl substituted C 1-6 alkyl (for example, -C 1-6 alkyl-S-C 1-6 alkyl).
  • R 2A can be a C 1-6 haloalkyl.
  • R 2A can be an optionally substituted C 2-6 alkenyl.
  • R 2A can be a substituted C 2-6 alkenyl.
  • R 2A can be an unsubstituted C 2-6 alkenyl.
  • R 2A can be ethenyl, propenyl or allenyl.
  • R 2A can be an optionally substituted C 2-6 alkynyl.
  • R 2A can be a substituted C 2-6 alkynyl.
  • R 2A can be an unsubstituted C 2-6 alkynyl. Suitable C 2-6 alkynyls include ethynyl and propynyl.
  • R 2A can be an optionally substituted C 3-6 cycloalkyl.
  • R 2A can be a substituted C 3-6 cycloalkyl.
  • R 2A can be an unsubstituted C 3-6 cycloalkyl.
  • a non-limiting list of C 3-6 cycloalkyls include cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.
  • R 2A can be an optionally substituted -O-C 1-6 alkyl.
  • R 2A can be a substituted -O-C 1-6 alkyl.
  • R 2A can be an unsubstituted -O-C 1-6 alkyl.
  • R 2A can be an optionally substituted -O-C 3-6 alkenyl.
  • R 2A can be a substituted -O-C 3-6 alkenyl.
  • R 2A can be an unsubstituted -O-C 3-6 alkenyl.
  • R 2A can be an optionally substituted -O-C 3-6 alkynyl.
  • R 2A can be a substituted -O-C 3-6 alkynyl. In other embodiments, R 2A can be an unsubstituted -O-C 3-6 alkynyl. In yet still other embodiments, R 2A can be cyano.
  • R 3A can be OH.
  • R 3A can be an optionally substituted O-linked amino acid.
  • suitable O-linked amino acids include alanine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine, tyrosine, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.
  • suitable amino acids include, but are not limited to, ornithine, hypusine, 2-aminoisobutyric acid, dehydroalanine, gamma-aminobutyric acid, citrulline, beta-alanine, alpha-ethyl-glycine, alpha-propyl-glycine and norleucine.
  • the O-linked amino acid can have the structure wherein R 42A can be selected from hydrogen, an optionally substituted C 1-6 alkyl, an optionally substituted C 1-6 haloalkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 6 aryl, an optionally substituted C 10 aryl and an optionally substituted aryl(C 1-6 alkyl); and R 43A can be hydrogen or an optionally substituted C 1-4 -alkyl; or R 42A and R 43A can be taken together to form an optionally substituted C 3-6 cycloalkyl.
  • R 42A When R 42A is substituted, R 42A can be substituted with one or more substituents selected from N-amido, mercapto, alkylthio, an optionally substituted aryl, hydroxy, an optionally substituted heteroaryl, O-carboxy, and amino.
  • R 42A can be an unsubstituted C 1-6 -alkyl, such as those described herein.
  • R 42A can be hydrogen.
  • R 42A can be methyl.
  • R 43A can be hydrogen.
  • R 43A can be an optionally substituted C 1-4 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl. In an embodiment, R 43A can be methyl.
  • the carbon to which R 42A and R 43A are attached may be a chiral center. In some embodiment, the carbon to which R 42A and R 43A are attached may be a (R)-chiral center. In other embodiments, the carbon to which R 42A and R 43A are attached may be a (S)-chiral center.
  • R 44A can be a substituted C 1-12 alkyl.
  • R 44A can be an unsubstituted C 1-12 alkyl.
  • R 5A can be hydrogen. In other embodiments, R 5A can be halogen, for example, fluoro. In some embodiments, R 4A can be halogen, such as fluoro. In some embodiments, R 5A can be hydrogen and R 4A can be halogen. In other embodiments, R 4A and R 5A can both be halogen.
  • ---- can be a single bond
  • R 4A can be fluoro
  • R 5A can be hydrogen
  • R 2A can be a C 1-6 haloalkyl.
  • ---- can be a single bond
  • R 4A can be fluoro
  • R 5A can be hydrogen
  • R 2A can be a C 1-6 haloalkyl
  • B 1A can be cytosine.
  • R 2A cannot be methoxy. In some embodiments, R 2A cannot be methoxy when B 1A is substituted or unsubstituted uracil. In some embodiments, B 1A is substituted or unsubstituted cytosine. In other embodiments, B 1A is substituted or unsubstituted thymine. In still other embodiments, B 1A cannot be an unsubstituted uracil.
  • R 2A cannot be methoxy when Z 1A is wherein R 8A is an unsubstituted C 1-6 alkyl or a para-substituted phenyl; and R 9A is an optionally substituted N-linked amino acid or an optionally substituted N-linked amino acid ester derivative.
  • R 2A cannot be methoxy when Z 1A is
  • R 2A cannot be an alkoxy (for example, when Z 1A is ).
  • B 1A cannot be cytosine when R 2A is an unsubstituted alkenyl or an unsubstiuted alkynyl.
  • B 1A cannot be thymine when R 2A is an optionally substituted alkyl.
  • R 2A cannot be an unsubstituted alkoxy (such as methoxy), an optionally substituted alkenyl (such as allenyl), an unsubstituted alkynyl (such as ethynyl) or a C 1 alkyl substituted with a non-halogen substituent.
  • R 2A cannot be an unsubstituted alkoxy (such as methoxy), an optionally substituted alkenyl (such as allenyl), an optionallys substituted substituted alkynyl (such as ethynyl) or a C 1-4 alkyl substituted with a non-halogen substituent.
  • R 1A cannot be H.
  • R 1A cannot be H when B 1A is an optionally substituted cytosine or an optionally substituted thymine.
  • amine and/or amino groups may be protected with a suitable protecting group.
  • an amino group may be protected by transforming the amine and/or amino group to an amide or a carbamate.
  • a compound of Formula (I) can have a structure selected from one of the following: or a pharmaceutically acceptable salt of the foregoing.
  • B 1A can be an optionally substituted purine base.
  • B 1A can be an optionally substituted pyrimidine base.
  • B 1A can be guanine.
  • B 1A can be thymine.
  • B 1A can be cytosine.
  • B 1A can be uracil.
  • B 1A can be adenine.
  • R 1A can be hydrogen.
  • R 1A can be an optionally substituted acyl. In still other embodiments of this paragraph, R 1A can be mono-, di- or tri-phosphate. In yet other embodiments of this paragraph, R 1A can be phosphoroamidate. In some embodiments of this paragraph, R 1A can be an acyloxyalkyl ester phosphate prodrug.
  • the compound can be a compound of Formula (II), or a pharmaceutically acceptable salt thereof, wherein: B 1B can be an optionally substituted heterocyclic base or an optionally substituted heterocyclic base with a protected amino group; R 1B can be selected from O - , OH, an optionally substituted N-linked amino acid and an optionally substituted N-linked amino acid ester derivative; R 2B can be selected from an optionally substituted C 1-6 alkyl, an optionally substituted C 2-6 alkenyl, an optionally substituted C 2-6 alkynyl, an optionally substituted -O-C 1-6 alkyl, an optionally substituted -O-C 3-6 alkenyl, an optionally substituted -O-C 3-6 alkynyl and cyano; R 3B can be a halogen; R 4B can be hydrogen or halogen; R 5B , R 6B , R 8B and R 9B can be independently selected from hydrogen, an optionally substituted C 1
  • R 1B can be O - . In other embodiments, R 1B can be OH.
  • R 1B can be wherein R 5B and R 6B can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl and an optionally substituted aryl; and R 7B can be selected from hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted aryl, an optionally substituted -O-C 1-24 alkyl and an optionally substituted -O-aryl.
  • R 5B and R 6B can be hydrogen.
  • at least one of R 5B and R 6B can be an optionally substituted C 1-24 alkyl or an optionally substituted aryl.
  • R 7B can be an optionally substituted C 1-24 alkyl.
  • R 7B can be an optionally substituted aryl.
  • R 7B can be an optionally substituted -O-C 1-24 alkyl or an optionally substituted - O-aryl.
  • R 1B can be wherein R 8B and R 9B can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl and an optionally substituted aryl; R 10B can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted aryl, an optionally substituted -O-C 1-24 alkyl and an optionally substituted -O-aryl; and Z 2B can be independently O (oxygen) or S (sulfur). In some embodiments, R 8B and R 9B can be hydrogen. In other embodiments, at least one of R 8B and R 9B can be an optionally substituted C 1-24 alkyl or an optionally substituted aryl.
  • R 10B can be an optionally substituted C 1-24 alkyl. In other embodiments, R 10B can be an optionally substituted aryl. In still other embodiments, R 10B can be an optionally substituted -O-C 1-24 alkyl or an optionally substituted -O-aryl.
  • Z 2B can be O (oxygen). In other embodiments, Z 2B can be or S (sulfur). In some embodiments, R 1B can be isopropylcarbonyloxymethyloxy. In some embodiments, R 1B can be pivaloyloxymethyloxy.
  • R 1B can be In some embodiments, R 11B can be hydrogen. In other embodiments, R 11B can be an optionally substituted C 1-24 alkyl. In still other embodiments, R 11B can be an optionally substituted aryl. In some embodiments, R 11B can be a C 1-6 alkyl, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 1B can be an optionally substituted N-linked amino acid or an optionally substituted N-linked amino acid ester derivative.
  • R 1B can be optionally substituted version of the following: alanine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine, tyrosine, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine and ester derivatives thereof.
  • R 1B can be selected from alanine isopropyl ester, alanine cyclohexyl ester, alanine neopentyl ester, valine isopropyl ester and leucine isopropyl ester.
  • R 1B can have the structure wherein R 12B can be selected from hydrogen, an optionally substituted C 1-6 -alkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted aryl, an optionally substituted aryl(C 1-6 alkyl) and an optionally substituted haloalkyl; R 13B can be selected from hydrogen, an optionally substituted C 1-6 alkyl, an optionally substituted C 1-6 haloalkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 6 aryl, an optionally substituted C 10 aryl and an optionally substituted aryl(C 1-6 alkyl); and R 14B can be hydrogen or an optionally substituted C 1-4 -alkyl; or R 13B and R 14B can be taken together to form an optionally substituted C 3-6 cycloalkyl.
  • R 13B When R 13B is substituted, R 13B can be substituted with one or more substituents selected from N-amido, mercapto, alkylthio, an optionally substituted aryl, hydroxy, an optionally substituted heteroaryl, O-carboxy, and amino.
  • R 13B can be an unsubstituted C 1-6 -alkyl, such as those described herein.
  • R 13B can be hydrogen.
  • R 13B can be methyl.
  • R 12B can be an optionally substituted C 1-6 alkyl.
  • optionally substituted C 1-6 -alkyls include optionally substituted variants of the following: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 12B can be methyl or isopropyl.
  • R 12B can be ethyl or neopentyl.
  • R 12B can be an optionally substituted C 3-6 cycloalkyl.
  • optionally substituted C 3-6 cycloalkyl examples include optionally substituted variants of the following: cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
  • R 12B can be an optionally substituted cyclohexyl.
  • R 12B can be an optionally substituted aryl, such as phenyl and naphthyl.
  • R 12B can be an optionally substituted aryl(C 1-6 alkyl).
  • R 12B can be an optionally substituted benzyl.
  • R 12B can be an optionally substituted C 1-6 haloalkyl, for example, CF 3 .
  • R 14B can be hydrogen. In other embodiments, R 14B can be an optionally substituted C 1-4 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl. In an embodiment, R 14B can be methyl. In some embodiments, R 13B and R 14B can be taken together to form an optionally substituted C 3-6 cycloalkyl. Examples of optionally substituted C 3-6 cycloalkyl include optionally substituted variants of the following: cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
  • the carbon to which R 13B and R 14B are attached may be a chiral center.
  • the carbon to which R 13B and R 14B are attached may be a (R)-chiral center.
  • the carbon to which R 13B and R 14B are attached may be a (S)-chiral center.
  • Suitable groups include the following:
  • R 2B can be an optionally substituted C 1-6 alkyl.
  • suitable C 1-6 alkyls include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 2B can be an unsubstituted C 1-6 alkyl. In other embodiments, R 2B can be a substituted C 1-6 alkyl.
  • R 2B can be a halogen substituted C 1-6 alkyl, a hydroxy substituted C 1-6 alkyl, an alkoxy substituted C 1-6 alkyl or a sulfenyl substituted C 1-6 alkyl (for example, -C 1-6 alkyl-S-C 1-6 alkyl).
  • R 2B can be a C 1-6 haloalkyl.
  • R 2B can be an optionally substituted C 2-6 alkenyl.
  • R 2B can be a substituted C 2-6 alkenyl.
  • R 2B can be an unsubstituted C 2-6 alkenyl.
  • R 2B can be ethenyl, propenyl or allenyl.
  • R 2B can be an optionally substituted C 2-6 alkynyl.
  • R 2B can be a substituted C 2-6 alkynyl.
  • R 2B can be an unsubstituted C 2-6 alkynyl. Suitable C 2-6 alkynyls include ethynyl and propynyl.
  • R 2B can be an optionally substituted C 3-6 cycloalkyl.
  • R 2B can be a substituted C 3-6 cycloalkyl.
  • R 2B can be an unsubstituted C 3-6 cycloalkyl.
  • a non-limiting list of C 3-6 cycloalkyls include cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.
  • R 2B can be an optionally substituted -O-C 1-6 alkyl.
  • R 2B can be a substituted -O-C 1-6 alkyl.
  • R 2B can be an unsubstituted -O-C 1-6 alkyl.
  • R 2B can be an optionally substituted - O-C 3-6 alkenyl.
  • R 2B can be a substituted - O-C 3-6 alkenyl.
  • R 2B can be an unsubstituted -O-C 3-6 alkenyl.
  • R 2B can be an optionally substituted -O-C 3-6 alkynyl.
  • R 2B can be a substituted - O-C 3-6 alkynyl. In other embodiments, R 2B can be an unsubstituted -O-C 3-6 alkynyl. In yet still other embodiments, R 2B can be cyano.
  • R 4B can be hydrogen. In other embodiments, R 4B can be halogen, such as fluoro. In some embodiments, R 3B can be halogen, such as fluoro. In some embodiments, R 4B can be hydrogen and R 3B can be halogen. In other embodiments, R 3B and R 4B can be both halogen. For example, R 3B and R 4B can be both fluoro.
  • Z 1B can be O (oxygen). In other embodiments, Z 1B can be S (sulfur).
  • amine and/or amino groups may be protected with a suitable protecting group.
  • an amino group may be protected by transforming the amine and/or amino group to an amide or a carbamate.
  • a compound of Formula (II) can have the following structure: or a pharmaceutically acceptable salt of the foregoing.
  • B 1B can be an optionally substituted purine base.
  • B 1B can be an optionally substituted pyrimidine base.
  • B 1B can be guanine.
  • B 1B can be thymine.
  • B 1B can be cytosine.
  • B 1B can be uracil.
  • B 1B can be adenine.
  • Z 1B can be oxygen.
  • Z 1B can be sulfur.
  • R 1B can be alkylcarbonyloxyalkoxy.
  • each R 7C and each R 8C can be independently hydrogen or halogen.
  • the R 7C and the R 8C groups can all be hydrogen.
  • one R 7C can be halogen, one R 7C can be hydrogen and both R 8C groups can all be hydrogen.
  • one R 7C can be halogen, one R 7C can be hydrogen, one R 8C can be halogen and one R 8C can be hydrogen.
  • the carbon adjacent to the phosphorus and the 5'-carbon can each be independently a (S)-chiral center.
  • the carbon adjacent to the phosphorus and the 5'-carbon can each be independently a (R)-chiral center.
  • ------- can be a double bond such that Formula (III) has the structure wherein each R 7C is absent and each R 8C can be independently hydrogen or halogen.
  • both R 8C groups can be hydrogen.
  • one R 8C can be halogen and the other R 8C can be hydrogen.
  • both R 8C groups can be halogen.
  • the double bond has a (Z)-configuration.
  • the double bond has a ( E )-configuration.
  • R 1C and/or R 2C can be O - . In other embodiments, R 1C and/or R 2C can be OH. In some embodiments, R 1C and R 2C can be both OH.
  • R 1C and/or R 2C can be wherein R 9C and R 10C can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl and an optionally substituted aryl; and R 110 can be selected from hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted aryl, an optionally substituted -O-C 1-24 alkyl and an optionally substituted -O-aryl.
  • P 9C and R 10C can be hydrogen.
  • at least one of R 9C and R 10C can be an optionally substituted C 1-24 alkyl or an optionally substituted aryl.
  • R 110 can be an optionally substituted C 1-24 alkyl.
  • R 11C can be an optionally substituted aryl. In still other embodiments, R 11C can be an optionally substituted -O-C 1-24 alkyl or an optionally substituted - O-aryl. In some embodiments, R 1C and R 2C can be both
  • R 1C and/or R 2C can be wherein R 12C and R 13C can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl and an optionally substituted aryl; R 14C can be independently selected from hydrogen, an optionally substituted C 1-24 alkyl, an optionally substituted aryl, an optionally substituted -O-C 1-24 alkyl and an optionally substituted -O-aryl; and Z 1C can be independently O (oxygen) or S (sulfur).
  • R 12C and R 13C can be hydrogen. In other embodiments, at least one of R 12C and R 13C can be an optionally substituted C 1-24 alkyl or an optionally substituted aryl.
  • R 14C can be an optionally substituted C 1-24 alkyl. In other embodiments, R 14C can be an optionally substituted aryl. In still other embodiments, R 14C can be an optionally substituted -O-C 1-24 alkyl or an optionally substituted -O-aryl.
  • Z 1C can be O (oxygen). In other embodiments, Z 1C can be or S (sulfur). In some embodiments, R 1C and/or R 2C can be isopropylcarbonyloxymethoxy. In some embodiments, R 1C and/or R 2C can be pivaloyloxymethoxy.
  • R 1C and R 2C can be both In some embodiments, R 1C and R 2C can be both isopropylcarbonyloxymethoxy. In other embodiments, R 1C and R 2C can be both pivaloyloxymethoxy.
  • R 1C and/or R 2C can be In some embodiments, R 15C can be hydrogen. In other embodiments, R 15C can be an optionally substituted C 1-24 alkyl. In still other embodiments, R 15C can be an optionally substituted aryl. In some embodiments, R 15C can be a C 1-6 alkyl, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained). In some embodiments, R 1C and R 2C can be both
  • R 1C and/or R 2C can be an optionally substituted N-linked amino acid or an optionally substituted N-linked amino acid ester derivative.
  • R 1C and/or R 2C can be optionally substituted version of the following: alanine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine, tyrosine, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine and ester derivatives thereof.
  • R 1C and/or R 2C can be selected from alanine isopropyl ester, alanine cyclohexyl ester, alanine neopentyl ester, valine isopropyl ester and leucine isopropyl ester.
  • R 1C and/or R 2C can have the structure wherein R 19C can be selected from hydrogen, an optionally substituted C 1-6 -alkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted aryl, an optionally substituted aryl(C 1-6 alkyl) and an optionally substituted haloalkyl; R 20C can be selected from hydrogen, an optionally substituted C 1-6 alkyl, an optionally substituted C 1-6 haloalkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 6 aryl, an optionally substituted C 10 aryl and an optionally substituted aryl(C 1-6 alkyl); and R 21C can be hydrogen or an optionally substituted C 1-4 -alkyl; or R 20C and R 21C can be taken together to form an optionally substituted C 3-6 cycloalkyl.
  • R 20C When R 20C is substituted, R 20C can be substituted with one or more substituents selected from N-amido, mercapto, alkylthio, an optionally substituted aryl, hydroxy, an optionally substituted heteroaryl, O-carboxy, and amino.
  • R 20C can be an unsubstituted C 1-6 -alkyl, such as those described herein.
  • R 20C can be hydrogen.
  • R 20C can be methyl.
  • R 19C can be an optionally substituted C 1-6 alkyl.
  • optionally substituted C 1-6 -alkyls include optionally substituted variants of the following: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 19C can be methyl or isopropyl.
  • R 19C can be ethyl or neopentyl.
  • R 19C can be an optionally substituted C 3-6 cycloalkyl.
  • optionally substituted C 3-6 cycloalkyl examples include optionally substituted variants of the following: cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
  • R 19C can be an optionally substituted cyclohexyl.
  • R 19C can be an optionally substituted aryl, such as phenyl and naphthyl.
  • R 19C can be an optionally substituted aryl(C 1-6 alkyl).
  • R 19C can be an optionally substituted benzyl.
  • R 19C can be an optionally substituted C 1-6 haloalkyl, for example, CF 3 .
  • R 21C can be hydrogen. In other embodiments, R 21C can be an optionally substituted C 1-4 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl. In an embodiment, R 21C can be methyl. In some embodiments, R 20C and R 21C can be taken together to form an optionally substituted C 3-6 cycloalkyl. Examples of optionally substituted C 3-6 cycloalkyl include optionally substituted variants of the following: cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
  • the carbon to which R 20C and R 21C are attached may be a chiral center.
  • the carbon to which R 20C and R 21C are attached may be a (R)-chiral center.
  • the carbon to which R 20C and R 21C are attached may be a (S)-chiral center.
  • Suitable groups include the following:
  • R 1C and R 2C can be the same. In other embodiments, R 1C and R 2C can be different.
  • R 1C can be and R 2C can be O - or OH, wherein R 16C , R 17C and R 18C can be absent or hydrogen; and n can be 0 or 1.
  • R 16C , R 17C and R 18C can be absent or hydrogen
  • n can be 0 or 1.
  • the compound of Formula (III) when n is 0, will be a diphosphate. In other embodiments, when n is 1, the compound of Formula (III) will be a triphosphate.
  • R 3C can be an optionally substituted C 1-6 alkyl.
  • suitable C 1-6 alkyls include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl (branched and straight-chained), and hexyl (branched and straight-chained).
  • R 3C can be an unsubstituted C 1-6 alkyl. In other embodiments, R 3C can be a substituted C 1-6 alkyl.
  • R 3C can be a halogen substituted C 1-6 alkyl. In other embodiments, R 3C can be an optionally substituted C 2-6 alkenyl. In some embodiments, R 3C can be a substituted C 2-6 alkenyl. In other embodiments, R 3C can be an unsubstituted C 2-6 alkenyl. For example, R 3C can be ethenyl, propenyl or allenyl. In still other embodiments, R 3C can be an optionally substituted C 2-6 alkynyl. In some embodiments, R 3C can be a substituted C 2-6 alkynyl. In other embodiments, R 3C can be an unsubstituted C 2-6 alkynyl.
  • Suitable C 2-6 alkynyls include ethynyl and propynyl.
  • R 3C can be an optionally substituted C 3-6 cycloalkyl.
  • R 3C can be a substituted C 3-6 cycloalkyl.
  • R 3C can be an unsubstituted C 3-6 cycloalkyl.
  • a non-limiting list of C 3-6 cycloalkyls include cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.
  • R 3C can be an optionally substituted -O-C 1-6 alkyl.
  • R 3C can be a substituted -O-C 1-6 alkyl. In other embodiments, R 3C can be an unsubstituted -O-C 1-6 alkyl. Examples of suitable O-C 1-6 alkyl groups include methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, isobutoxy, tert-butoxy, pentoxy (branched and straight-chained), and hexoxy (branched and straight-chained). In other embodiments, R 3C can be an optionally substituted -O-C 3-6 alkenyl. In some embodiments, R 3C can be a substituted -O-C 3-6 alkenyl.
  • R 3C can be an unsubstituted -O-C 3-6 alkenyl. In still other embodiments, R 3C can be an optionally substituted -O-C 3-6 alkynyl. In some embodiments, R 3C can be a substituted -O-C 3-6 alkynyl. In other embodiments, R 3C can be an unsubstituted -O-C 3-6 alkynyl. In yet still other embodiments, R 3C can be cyano.
  • R 4C can be OH.
  • R 4C can be an optionally substituted O-linked amino acid.
  • suitable O-linked amino acids include alanine, asparagine, aspartate, cysteine, glutamate, glutamine, glycine, proline, serine, tyrosine, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.
  • suitable amino acids include, but are not limited to, ornithine, hypusine, 2-aminoisobutyric acid, dehydroalanine, gamma-aminobutyric acid, citrulline, beta-alanine, alpha-ethyl-glycine, alpha-propyl-glycine and norleucine.
  • the O-linked amino acid can have the structure wherein R 22C can be selected from hydrogen, an optionally substituted C 1-6 alkyl, an optionally substituted C 1-6 haloalkyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted C 6 aryl, an optionally substituted C 10 aryl and an optionally substituted aryl(C 1-6 alkyl); and R 23C can be hydrogen or an optionally substituted C 1-4 -alkyl; or R 22C and R 23C can be taken together to form an optionally substituted C 3-6 cycloalkyl.
  • R 22C When R 22C is substituted, R 22C can be substituted with one or more substituents selected from N-amido, mercapto, alkylthio, an optionally substituted aryl, hydroxy, an optionally substituted heteroaryl, O-carboxy, and amino.
  • R 22C can be an unsubstituted C 1-6 -alkyl, such as those described herein.
  • R 22C can be hydrogen.
  • R 22C can be methyl.
  • R 23C can be hydrogen.
  • R 23C can be an optionally substituted C 1-4 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl. In an embodiment, R 23C can be methyl.
  • the carbon to which R 22C and R 23C are attached may be a chiral center. In some embodiment, the carbon to which R 22C and R 23C are attached may be a (R)-chiral center. In other embodiments, the carbon to which R 22C and R 23C are attached may be a (S)-chiral center.
  • R "C can be a substituted C 1-12 alkyl.
  • R "C can be an unsubstituted C 1-12 alkyl.
  • R 6C can be hydrogen. In other embodiments, R 6C can be halogen, such as fluoro. In some embodiments, R 5C can be halogen, such as fluoro. In some embodiments, R 6C can be hydrogen and R 5C can be halogen. In other embodiments, R 5C and R 6C can be both halogen. For example, R 5C and R 6C can be both fluoro.
  • amine and/or amino groups may be protected with a suitable protecting group.
  • an amino group may be protected by transforming the amine and/or amino group to an amide or a carbamate.
  • B 1C can be In other embodiments, B 1C can be In still other embodiments, B 1C can be such as In yet still other embodiments, B 1C can for example,
  • R DC2 can be hydrogen.
  • B 1C can be In some embodiments, R BC2 can be NH 2 .
  • B 1C can be In some embodiments, B 1C can be In some embodiments, B 1C can be In some embodiments, B 1C can be
  • the compound of Formula (III) can have one of the following structures:
  • B 1C can be an optionally substituted purine base.
  • B 1C can be an optionally substituted pyrimidine base.
  • B 1C can be guanine.
  • B 1C can be thymine.
  • B 1C can be cytosine.
  • B 1C can be uracil.
  • B 1C can be adenine.
  • R 1C and R 2C can each be an optionally substituted C 1-4 alkyl.
  • R 1A can be an optionally substituted acyl.
  • R 1C and R 2C can form a mono-, di- or tri-phosphate.
  • R 1C and R 2C can each be an alkylcarbonyloxyalkoxy.
  • R 4C can be OH.
  • R 5C can be F and R 6C can be hydrogen.
  • Suitable compounds of Formula (I) include, but are not limited to the following: or a pharmaceutically acceptable salt of the foregoing.
  • Additional examples of a compound of Formula (I) include the following: and or a pharmaceutically acceptable salt of the foregoing.
  • a compound of Formula (I) include, but are not limited to the following: or a pharmaceutically acceptable salt of the foregoing.
  • Examples of a compound of Formula (II) include, but are not limited to, the following: or a pharmaceutically acceptable salt of the foregoing.
  • Examples of a compound of Formula (III) include, but are not limited to, the following: or a pharmaceutically acceptable salt of the foregoing.
  • a compound of Formula (III) include, but are not limited to, the following: or a pharmaceutically acceptable salt of the foregoing.
  • compounds of Formula (I) can be prepared from a nucleoside, for example, a nucleoside of Formula (A).
  • R 3a , R 4a , R 5a , and B 1a can be the same as R 3A , R 4A , R 5A , and B 1A as described herein for Formula (I), and PG 1 is a suitable protecting group.
  • a hydroxyalkyl group can be formed at the 4'-position of the pentose ring using suitable conditions known to those skilled in the art. Examples of suitable conditions for forming a hydroxyalkyl include the use of 2-iodoxybenzoic acid (IBX) aqueous formaldehyde and sodium borohydride.
  • IBX 2-iodoxybenzoic acid
  • a compound of Formula (B) can be oxidized to an aldehyde using a suitable oxidizing agent(s) to form a compound of Formula (C).
  • suitable oxidizing agent is Dess-Martin periodinane.
  • An optionally substituted C 2-6 alkenyl or an optionally substituted C 2-6 alkynyl can be formed at the 4'-position using methods known to those skilled in the art, for example, Wittig reagent and n-BuLi, Wittig-type reactions, Peterson olefination reaction, and Corey Fuchs reaction.
  • An optionally substituted C 1-6 alkyl can be obtained by hydrogenating the unsaturated group attached to the 4'-position, for example, using hydrogen over palladium on carbon.
  • a compound of Formula (B) can be transformed to a haloalkyl using a suitable agent(s), for example, to an iodide using imidazole, triphenylphosphine and iodine; to a fluoro using diethylaminosulfur trifluoride (DAST); or to a chloro using triphenylphosphine and carbontetrachloride in dichloroethylene (DCE).
  • An iodoalkyl can be transformed to an unsubstituted C 1-6 alkyl group using methods known to those skilled in the art, for example, hydrogen over palladium on carbon.
  • a compound of Formula (C) can be reacted with hydroxylamine to form an oxime.
  • the oxime can be transformed to a cyano group using methods known to those skilled in the art, for example, using methanesulfonyl chloride.
  • compounds of Formula (I), where R 2A is an optionally substituted -O-C 1-6 alkyl, an optionally substituted -O-C 3-6 alkenyl or an optionally substituted -O-C 3-6 alkynyl can be prepared from a nucleoside, for example, a nucleoside of Formula (A).
  • R 2a , R 3a , R 4a , R 5a and B 1a can be the same as R 2A , R 3A , R 4A , R 5A and B 1A as described herein for Formula (I)
  • PG 2 can be a suitable protecting group.
  • the nucleoside can undergo elimination and form an olefin having the general formula of Formula (D).
  • a compound of Formula (D) can be treated with an iodinating reagent in the presence of lead carbonate and an alkoxy source to form a compound of Formula (E).
  • a compound of Formula (E) can then be transformed to a compound of Formula (I) through displacement of the iodide with an oxygen nucleophile.
  • Compounds of Formula (I) having a phosphorus containing group attached to the 5'-position of the pentose ring can be prepared using various methods known to those skilled in the art. Examples of methods are shown in Schemes 3 and 4.
  • a phosphorus containing precursor can be coupled to the nucleoside, for example, a compound of Formula (F) or a compound of Formula (G).
  • any leaving groups can be cleaved under suitable conditions, such as hydrolysis.
  • Further phosphorus containing groups can be added using methods known to those skilled in the art, for example using a pyrophosphate.
  • an alkoxide can be generated from a compound of Formula (G) using an organometallic reagent, such as a Grignard reagent.
  • the alkoxide can be coupled to the phosphorus containing precursor.
  • Suitable Grignard reagents are known to those skilled in the art and include, but are not limited to, alkylmagnesium chlorides and alkylmagnesium bromides.
  • an appropriate base can be used. Examples of suitable bases include, but are not limited to, an amine base, such as an alkylamine (including mono-, di- and tri-alkylamines (e.g., triethylamine)), optionally substituted pyridines (e.g.
  • a phosphorus containing precursor can be added to the nucleoside and form a phosphite.
  • the phosphite can be oxidized to a phosphate using conditions known to those skilled in the art. Suitable conditions include, but are not limited to, meta-chloroperoxybenzoic acid (MCPBA) and iodine as the oxidizing agent and water as the oxygen donor.
  • MCPBA meta-chloroperoxybenzoic acid
  • iodine as the oxidizing agent and water as the oxygen donor.
  • the sulfur can be added in various manners known to those skilled in the art.
  • the sulfur can be part of the phosphorus containing precursor, for example, or Alternatively, the sulfur can be added using a sulfurization reagent.
  • Suitable sulfurization agents are known to those skilled in the art, and include, but are not limited to, elemental sulfur, Lawesson's reagent, cyclooctasulfur, 3H-1,2-Benzodithiole-3-one-1,1-dioxide (Beaucage's reagent), 3-((N,N-dimethylaminomethylidene)amino)-3H-1,2,4-dithiazole-5-thione (DDTT) and bis(3-triethoxysilyl)propyl-tetrasulfide (TEST).
  • elemental sulfur Lawesson's reagent
  • cyclooctasulfur 3H-1,2-Benzodithiole-3-one-1,1-dioxide
  • Beaucage's reagent 3-((N,N-dimethylaminomethylidene)amino)-3H-1,2,4-dithiazole-5-thione
  • Suitable phosphorus containing precursors can be commercially obtained or prepared by synthetic methods known to those skilled in the art. Examples of general structures of phosphorus containing precursors are shown in Schemes 3 and 4.
  • R 1b , R 2b , R 3b , R 4b and B 1b can be the same as R 1B , R 2B , R 3B , R 4B and B 1B as described herein for Formula (II), each L 1 can be a halogen, a sulfonate ester or an amine (mono- or disubstituted), and X can be oxygen or sulfur.
  • a compound having a hydroxy group attached to the 3'-carbon and a hydroxy group attached to the 5'-carbon can be reacted with a compound having the formula, (R 1b )P(L 1 ) 2 , in the presence of a base, to produce a phosphite compound.
  • Suitable bases are known to those skilled in the art and described herein.
  • the phosphorus can then be oxidized to phosphorus(V) using a suitable oxidizing agent, to produce a compound where X is O (oxygen).
  • the phosphite compound can be reacted with a sulfurization reagent to produce a compound where X is S (sulfur).
  • Suitable oxidizing and sulfurization agents are known to those skilled in the art.
  • the oxidation can be carried out using iodine as the oxidizing agent and water as the oxygen donor. Suitable sulfurization agents are described herein.
  • a method for forming a compound of Formula (III) is shown in Scheme 6.
  • R 1c , R 2c , R 3c , R 4c , R 5c , R 6c and B 1c can be the same as R 1C , R 2C , R 3C , R 4C , R 5C , R 6C and B 1C as described herein for Formula (III), and R 7C and R 8C are not shown.
  • the oxygen attached to the 5'-carbon of the compound of Formula (H) can be oxidized to a ketone using methods and reagents known to those skilled in the art.
  • an oxidizing agent such as Dess-Martin periodinane, can be utilized.
  • a phosphorus-containing reagent can then be added to a compound of Formula (J) in the presence of a strong base (e.g., sodium hydride).
  • a strong base e.g., sodium hydride
  • the double bond can be hydrogenated, for example using hydrogen gas or Pd/C, to a single bond.
  • Additional phosphates can be added via phosphorylation to form a di- or tri-phosphate using suitable reagents, such as a pyrophosphate (e.g., tetrabutylammonium pyrophosphate).
  • An acyl group can be added to the 5'-position and/or the 3'-position of a compound of Formula (I) or (III) using methods known to those skilled in the art.
  • One suitable method is using an anhydride in pyridine.
  • any hydroxy groups attached to the pentose ring, and any -NH and/or NH 2 groups present on the B 1a , B 1b and B 1c can be protected with one or more suitable protecting groups.
  • suitable protecting groups are described herein.
  • R 3a and/or R 4c is a hydroxy group
  • R 3a and/or R 4c can be protected with a triarylmethyl group or a silyl group.
  • any -NH and/or NH 2 groups present on the B 1a , B 1b and B 1c can be protected, such as with a triarylmethyl and a silyl group(s).
  • triarylmethyl groups include but are not limited to, trityl, monomethoxytrityl (MMTr), 4,4'-dimethoxytrityl (DMTr), 4,4',4"-trimethoxytrityl (TMTr),.
  • silyl groups include, but are not limited to, trimethylsilyl (TMS), tert -butyldimethylsilyl (TBDMS), triisopropylsilyl (TIPS), tert-butyldiphenylsilyl (TBDPS), tri- iso -propylsilyloxymethyl and [2-(trimethylsilyl)ethoxy]methyl.
  • R 3a and R 4a and/or R 4c and R 5c can be protected by a single achiral or chiral protecting group, for example, by forming an orthoester, a cyclic acetal or a cyclic ketal.
  • Suitable orthoesters include methoxymethylene acetal, ethoxymethylene acetal, 2-oxacyclopentylidene orthoester, dimethoxymethylene orthoester, 1-methoxyethylidene orthoester, 1-ethoxyethylidene orthoester, methylidene orthoester, phthalide orthoester 1,2-dimethoxyethylidene orthoester, and alpha-methoxybenzylidene orthoester;
  • suitable cyclic acetals include methylene acetal, ethylidene acetal, t-butylmethylidene acetal, 3-(benzyloxy)propyl acetal, benzylidene acetal, 3,4-dimethoxybenzylidene acetal and p-acetoxybenzylidene acetal; and suitable cyclic ketals include 1-t-butylethylidene ketal, 1-phenylethylid
  • any protecting group(s) can be removed by methods known in the art, for example, with an acid (e.g., a mineral or an organic acid), a base or a fluoride source.
  • an acid e.g., a mineral or an organic acid
  • compositions that can include an effective amount of one or more compounds described herein (e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing) and a pharmaceutically acceptable carrier, diluent, excipient or combination thereof.
  • a pharmaceutically acceptable carrier e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing
  • composition refers to a mixture of one or more compounds disclosed herein with other chemical components, such as diluents or carriers.
  • the pharmaceutical composition facilitates administration of the compound to an organism.
  • Pharmaceutical compositions can also be obtained by reacting compounds with inorganic or organic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, methanesulfonic acid, ethanesulfonic acid, p-toluenesulfonic acid, and salicylic acid.
  • Pharmaceutical compositions will generally be tailored to the specific intended route of administration.
  • physiologically acceptable defines a carrier, diluent or excipient that does not abrogate the biological activity and properties of the compound.
  • a “carrier” refers to a compound that facilitates the incorporation of a compound into cells or tissues.
  • DMSO dimethyl sulfoxide
  • DMSO dimethyl sulfoxide
  • a "diluent” refers to an ingredient in a pharmaceutical composition that lacks pharmacological activity but may be pharmaceutically necessary or desirable.
  • a diluent may be used to increase the bulk of a potent drug whose mass is too small for manufacture and/or administration. It may also be a liquid for the dissolution of a drug to be administered by injection, ingestion or inhalation.
  • a common form of diluent in the art is a buffered aqueous solution such as, without limitation, phosphate buffered saline that mimics the composition of human blood.
  • an “excipient” refers to an inert substance that is added to a pharmaceutical composition to provide, without limitation, bulk, consistency, stability, binding ability, lubrication, disintegrating ability etc., to the composition.
  • a “diluent” is a type of excipient.
  • compositions described herein can be administered to a human patient per se , or in pharmaceutical compositions where they are mixed with other active ingredients, as in combination therapy, or carriers, diluents, excipients or combinations thereof. Proper formulation is dependent upon the route of administration chosen. Techniques for formulation and administration of the compounds described herein are known to those skilled in the art.
  • compositions disclosed herein may be manufactured in a manner that is itself known, e.g., by means of conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping or tableting processes. Additionally, the active ingredients are contained in an amount effective to achieve its intended purpose. Many of the compounds used in the pharmaceutical combinations disclosed herein may be provided as salts with pharmaceutically compatible counterions.
  • Multiple techniques of administering a compound exist in the art including, but not limited to, oral, rectal, topical, aerosol, injection and parenteral delivery, including intramuscular, subcutaneous, intravenous, intramedullary injections, intrathecal, direct intraventricular, intraperitoneal, intranasal and intraocular injections.
  • compositions may, if desired, be presented in a pack or dispenser device which may contain one or more unit dosage forms containing the active ingredient.
  • the pack may for example comprise metal or plastic foil, such as a blister pack.
  • the pack or dispenser device may be accompanied by instructions for administration.
  • the pack or dispenser may also be accompanied with a notice associated with the container in form prescribed by a governmental agency regulating the manufacture, use, or sale of pharmaceuticals, which notice is reflective of approval by the agency of the form of the drug for human or veterinary administration. Such notice, for example, may be the labeling approved by the U.S. Food and Drug Administration for prescription drugs, or the approved product insert.
  • Compositions that can include a compound described herein formulated in a compatible pharmaceutical carrier may also be prepared, placed in an appropriate container, and labeled for treatment of an indicated condition.
  • Some embodiments described herein relate to a method of ameliorating, treating and/or preventing a viral infection selected from a paramyxovirus viral infection and an orthomyxovirus viral infection, which can include administering to a subject an effective amount of one or more compounds described herein, or a pharmaceutical composition that includes one or more compounds described herein (e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing).
  • the subject is identified as suffering from the viral infection (for example, a paramyxovirus viral infection or an orthomyxovirus viral infection).
  • inventions described herein relate to a method of inhibiting viral replication of a virus selected from a paramyxovirus and an orthomyxovirus, which can include contacting a cell infected with the virus with an effective amount of a compound of Formula (I), or a pharmaceutically acceptable salt thereof, an effective amount of a compound of Formula (II), or a pharmaceutically acceptable salt thereof, an effective amount of a compound of Formula (III), or a pharmaceutically acceptable salt thereof, and/or a pharmaceutical composition that includes one or more compounds described herein (e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing).
  • a pharmaceutical composition that includes one or more compounds described herein (e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing).
  • RSV respiratory syncytial viral
  • an effective amount of one or more compounds of Formula (I), or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, an effective amount of one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof, and/or a pharmaceutical composition that includes one or more compounds described herein (e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing) can be used treat and/or ameliorate an upper respiratory viral infection caused by a virus selected from a henipavirus, a morbillivirus, a respirovirus, a rubulavirus, a pneumovirus, a metapneumovirus and influenza virus.
  • an effective amount of one or more compounds of Formula (I), or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, an effective amount of one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof, and/or a pharmaceutical composition that includes one or more compounds described herein (e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing) can be used treat and/or ameliorate a lower respiratory viral infection caused by a virus selected from a henipavirus, a morbillivirus, a respirovirus, a rubulavirus, a pneumovirus, a metapneumovirus and influenza virus.
  • a virus selected from a henipavirus, a morbillivirus, a respirovirus, a rubulavirus, a pneumovirus, a metapneum
  • an effective amount of one or more compounds of Formula (I), or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, an effective amount of one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof, and/or a pharmaceutical composition that includes one or more compounds described herein (e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing) can be used treat and/or ameliorate an upper respiratory viral infection caused by RSV infection, measles, mumps, parainfluenza infection, metapneumovirus and/or influenza infection.
  • HPIV-3 human parainfluenza virus 3
  • HPIV-3 human parainfluenza virus 3
  • HPIV-1 human parainfluenza virus 1
  • an effective amount of one or more compounds of Formula (I), or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, an effective amount of one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof, and/or a pharmaceutical composition that includes one or more compounds described herein (e.g., a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing) can be used to prevent an influenza viral infection.
  • the influenza viral infection can be an influenza A viral infection.
  • the influenza viral infection can be an influenza B viral infection.
  • influenza viral infection can be an influenza C viral infection.
  • one or more compounds of Formula (I), or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, and/or one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof can be used to treat and/or ameliorate one or more subtypes of influenza.
  • one or more compounds of Formula (I), or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, and/or one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof can be used to treat H1N1 and/or H3N2.
  • the human parainfluenza viral infection can be a human parainfluenza virus 1 (HPIV-1).
  • the human parainfluenza viral infection can be a human parainfluenza virus 2 (HPIV-2). In other embodiments, the human parainfluenza viral infection can be a human parainfluenza virus 3 (HPIV-3). In other embodiments, the human parainfluenza viral infection can be a human parainfluenza virus 4 (HPIV-4).
  • one or more compounds of Formula (I), or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, and/or one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof can be used to treat and/or ameliorate one or more subtypes of human parainfluenza virus.
  • one or more compounds of Formula (I), or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, and/or one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof can be used to treat HPIV-1 and/or HPIV-3.
  • the one or more compounds of Formula (I) or a pharmaceutically acceptable salt thereof, one or more compounds of Formula (II), or a pharmaceutically acceptable salt thereof, and/or one or more compounds of Formula (III), or a pharmaceutically acceptable salt thereof, that can be used to treat, ameliorate and/or prevent a paramyxovirus and/or or an orthomyxovirus viral infection can be a compound of Formula (I), or pharmaceutically acceptable salt thereof, and/or a compound of Formula (II), or a pharmaceutically acceptable salt thereof, and/or a compound of Formula (III), or a pharmaceutically acceptable salt thereof, provided in any of the embodiments described in paragraphs [0084]-[0170].
  • prevention means a subject does not develop an infection because the subject has an immunity against the infection, or if a subject becomes infected, the severity of the disease is less compared to the severity of the disease if the subject has not been administered/received the compound.
  • forms of prevention include prophylactic administration to a subject who has been or may be exposed to an infectious agent, such as a paramyxovirus (e.g., RSV) and/or an orthomyxovirus (e.g., influenza).
  • an infectious agent such as a paramyxovirus (e.g., RSV) and/or an orthomyxovirus (e.g., influenza).
  • treatment does not necessarily mean total cure or abolition of the disease or condition. Any alleviation of any undesired signs or symptoms of a disease or condition, to any extent can be considered treatment and/or therapy.
  • treatment may include acts that may worsen the subject's overall feeling of well-being or appearance.
  • a therapeutically effective amount of compound can be the amount needed to prevent, alleviate or ameliorate symptoms of disease or prolong the survival of the subject being treated This response may occur in a tissue, system, animal or human and includes alleviation of the signs or symptoms of the disease being treated. Determination of an effective amount is well within the capability of those skilled in the art, in view of the disclosure provided herein.
  • the therapeutically effective amount of the compounds disclosed herein required as a dose will depend on the route of administration, the type of animal, including human, being treated, and the physical characteristics of the specific animal under consideration. The dose can be tailored to achieve a desired effect, but will depend on such factors as weight, diet, concurrent medication and other factors which those skilled in the medical arts will recognize.
  • Suitable indicators include, but are not limited to, a reduction in viral load, a reduction in viral replication, a reduction in time to seroconversion (virus undetectable in patient serum), a reduction of morbidity or mortality in clinical outcomes, and/or other indicator of disease response.
  • an effective amount of a compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing is an amount that is effective to reduce viral titers to undetectable levels, for example, to about 1000 to about 5000, to about 500 to about 1000, or to about 100 to about 500 genome copies/mL serum.
  • an effective amount of a compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing is an amount that is effective to reduce viral load compared to the viral load before administration of the compound of Formulae (I) ,(II) and/or (III), or a pharmaceutically acceptable salt of the foregoing.
  • an effective amount of a compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing can be an amount that is effective to reduce viral load to lower than about 100 genome copies/mL serum.
  • an effective amount of a compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing is an amount that is effective to achieve a reduction in viral titer in the serum of the subject in the range of about 1.5-log to about a 2.5-log reduction, about a 3-log to about a 4-log reduction, or a greater than about 5-log reduction compared to the viral load before administration of the compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing.
  • the viral load is measure before administration of the compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing, and again after completion of the treatment regime with the compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing (for example, 1 week after completion).
  • a compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing can result in at least a 1, 2, 3, 4, 5, 10, 15, 20, 25, 50, 75, 100-fold or more reduction in the replication of a paramyxovirus and/or an orthomyxovirus relative to pre-treatment levels in a subject, as determined after completion of the treatment regime (for example, 1 week after completion).
  • a compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing can result in a reduction of the replication of a paramyxovirus and/or an orthomyxovirus relative to pre-treatment levels in the range of about 2 to about 5 fold, about 10 to about 20 fold, about 15 to about 40 fold, or about 50 to about 100 fold.
  • a compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing can result in a reduction of paramyxovirus replication in the range of 1 to 1.5 log, 1.5 log to 2 log, 2 log to 2.5 log, 2.5 to 3 log, 3 log to 3.5 log or 3.5 to 4 log more reduction of paramyxovirus replication compared to the reduction of paramyxovirus reduction achieved by ribavirin (Virazole®), or may achieve the same reduction as that of ribavirin (Virazole®) therapy in a shorter period of time, for example, in one week, two weeks, one month, two months, or three months, as compared to the reduction achieved after six months of ribavirin (Virazole®) therapy.
  • a compound of Formulae (I), (II) and/or (III), or a pharmaceutically acceptable salt of the foregoing can result in a reduction of orthomyxovirus replication in the range of 1 to 1.5 log, 1.5 log to 2 log, 2 log to 2.5 log, 2.5 to 3 log, 3 log to 3.5 log or 3.5 to 4 log more reduction of orthomyxovirus replication compared to the reduction of orthomyxovirus reduction achieved by oseltamivir (Tamiflu®), or may achieve the same reduction as that of oseltamivir (Tamiflu®) therapy in a shorter period of time, for example, in one week, two weeks, one month, two months, or three months, as compared to the reduction achieved after six months of oseltamivir (Tamiflu®) therapy.
  • an effective amount of a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing is an amount that is effective to achieve a sustained viral response, for example, non-detectable or substantially non-detectable paramyxovirus and/or orthomyxovirus RNA (e.g., less than about 500, less than about 400, less than about 200, or less than about 100 genome copies per milliliter serum) is found in the subject's serum for a period of at least about one week, two weeks, one month, at least about two months, at least about three months, at least about four months, at least about five months, or at least about six months following cessation of therapy.
  • a sustained viral response for example, non-detectable or substantially non-detectable paramyxovirus and/or orthomyxovirus RNA (e.g., less than about 500, less than about 400, less than about 200, or less than about 100 genome copies per milliliter serum
  • resistance refers to a viral strain displaying a delayed, lessened and/or null response to a therapeutic agent(s).
  • the viral load of a subject infected with a resistant virus may be reduced to a lesser degree compared to the amount in viral load reduction exhibited by a subject infected with a non-resistant strain.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered to a subject infected with RSV that is resistant to one or more different anti-RSV agents (for example, ribavirin).
  • RSV that is resistant to one or more different anti-RSV agents (for example, ribavirin).
  • development of resistant RSV strains can be delayed when subjects are treated with a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing, compared to the development of RSV strains resistant to other RSV drugs.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered to a subject infected with an influenza virus that is resistant to one or more different anti-influenza agents (for example, amantadine and rimantadine).
  • development of resistant influenza strains can be delayed when subjects are treated with a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing, compared to the development of influenza strains resistant to other influenza drugs.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can decrease the percentage of subjects that experience complications from a RSV viral infection compared to the percentage of subjects that experience complication being treated with ribavirin.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can decrease the percentage of subjects that experience complications from an influenza viral infection compared to the percentage of subjects that experience complication being treated with oseltamivir.
  • the percentage of subjects being treated with a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing, that experience complications can be 10% , 25%, 40%, 50%, 60%, 70%, 80% and 90% less compared to subjects being treated with ribavirin or oseltamivir.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing, or a pharmaceutical composition that includes a compound described herein can be used in combination with one or more additional agent(s).
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be used in combination with one or more agents currently used for treating RSV.
  • the additional agent can be ribavirin, palivizumab and RSV-IGIV.
  • additional agents include but are not limited to ALN-RSV01 (Alnylam Pharmaceuticals), BMS-433771 (1-cyclopropyl-3-[[1-(4-hydroxybutyl)benzimidazol-2-yl]methyl]imidazo[4,5-c]pyridin-2-one), RFI-641 ((4,4"-bis- ⁇ 4,6-bis-[3-(bis-carbamoylmethyl-sulfamoyl)-phenylamino]-(1,3,5)triazin-2-ylamino ⁇ -biphenyl-2,2"-disulfonic-acid)), RSV604 ((S)-1-(2-fluorophenyl)-3-(2-oxo-5-phenyl-2,3-dihydro-1H-benzo[e][1,4]di-azepin-3-yl)-urea), MDT-637 ((4Z)-2-methylsulfanyl-4-[(E)
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be used in combination with one or more agents currently used for treating influenza.
  • the additional agent can be amantadine, rimantadine, zanamivir and oseltamivir.
  • additional agents include but are not limited to peramivir ((1S,2S,3S,4R)-3-[(1S)-1-acetamido-2-ethylbutyl]-4-(diaminomethylideneamino)-2-hydroxycyclopentane-1-carboxylic acid), laninamivir ((4S,5R,6R)-5-acetamido-4-carbamimidamido-6-[(1R,2R)-3-hydroxy-2-methoxypropyl]-5,6-dihydro-4H-pyran-2-carboxylic acid), favipiravir (T-705, 6-fluoro-3-hydroxy-2-pyrazinecarboxamide), fludase (DAS181, NexBio), ADS-8902 (Adamas Pharmaceuticals), IFN-b (Synairgen), beraprost (4-[2-hydroxy-1-[(E)-3-hydroxy-4-methyloct-1-en-6-y
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered with one or more additional agent(s) together in a single pharmaceutical composition.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered with one or more additional agent(s) as two or more separate pharmaceutical compositions.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered in one pharmaceutical composition, and at least one of the additional agents can be administered in a second pharmaceutical composition. If there are at least two additional agents, one or more of the additional agents can be in a first pharmaceutical composition that includes a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing, and at least one of the other additional agent(s) can be in a second pharmaceutical composition.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing, with one or more additional agent(s) can vary.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered prior to all additional agents.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered prior to at least one additional agent.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered concomitantly with one or more additional agent(s).
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered subsequent to the administration of at least one additional agent.
  • a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing can be administered subsequent to the administration of all additional agents.
  • a potential advantage of utilizing a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing, in combination with one or more additional agent(s) described in paragraph [0221], including pharmaceutically acceptable salts and prodrugs thereof, may be a reduction in the required amount(s) of one or more compounds of paragraph [0221] (including pharmaceutically acceptable salts and prodrugs thereof) that is effective in treating a disease condition disclosed herein (for example, RSV and/or influenza), as compared to the amount required to achieve same therapeutic result when one or more compounds described in paragraph [0221], including pharmaceutically acceptable salts and prodrugs thereof, are administered without a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt the foregoing.
  • a disease condition disclosed herein for example, RSV and/or influenza
  • the amount of a compound described in paragraph [0221], including a pharmaceutically acceptable salt and prodrug thereof can be less compared to the amount of the compound described in paragraph [0221], including a pharmaceutically acceptable salt and prodrug thereof, needed to achieve the same viral load reduction when administered as a monotherapy.
  • Another potential advantage of utilizing a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt of the foregoing, in combination with one or more additional agent(s) described in paragraph [0221], including pharmaceutically acceptable salts and prodrugs thereof, is that the use of two or more compounds having different mechanism of actions can create a higher barrier to the development of resistant viral strains compared to the barrier when a compound is administered as monotherapy.
  • Additional advantages of utilizing a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt the foregoing, in combination with one or more additional agent(s) described in paragraph [0221], including pharmaceutically acceptable salts and prodrugs thereof, may include little to no cross resistance between a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt the foregoing, and one or more additional agent(s) described in paragraph [0221] (including pharmaceutically acceptable salts and prodrugs thereof); different routes for elimination of a compound of Formula (I), a compound of Formula (II) and/or a compound of Formula (III), or a pharmaceutically acceptable salt the foregoing, and one or more additional agent(s) described in paragraph [0221] (including pharmaceutically acceptable salts and prodrugs thereof); little to no overlapping toxicities between a compound of Formula (I), a compound of Formula (II) and/or
  • the useful in vivo dosage to be administered and the particular mode of administration will vary depending upon the age, weight, the severity of the affliction, and mammalian species treated, the particular compounds employed, and the specific use for which these compounds are employed.
  • the determination of effective dosage levels that is the dosage levels necessary to achieve the desired result, can be accomplished by one skilled in the art using routine methods, for example, human clinical trials and in vitro studies.
  • the dosage may range broadly, depending upon the desired effects and the therapeutic indication. Alternatively dosages may be based and calculated upon the surface area of the patient, as understood by those of skill in the art. Although the exact dosage will be determined on a drug-by-drug basis, in most cases, some generalizations regarding the dosage can be made.
  • the daily dosage regimen for an adult human patient may be, for example, an oral dose of between 0.01 mg and 3000 mg of each active ingredient, preferably between 1 mg and 700 mg, e.g. 5 to 200 mg.
  • the dosage may be a single one or a series of two or more given in the course of one or more days, as is needed by the subject.
  • the compounds will be administered for a period of continuous therapy, for example for a week or more, or for months or years.
  • human dosages for compounds have been established for at least some condition, those same dosages may be used, or dosages that are between about 0.1% and 500%, more preferably between about 25% and 250% of the established human dosage.
  • a suitable human dosage can be inferred from ED 50 or ID 50 values, or other appropriate values derived from in vitro or in vivo studies, as qualified by toxicity studies and efficacy studies in animals.
  • dosages may be calculated as the free base.
  • dosages may be calculated as the free base.
  • Dosage amount and interval may be adjusted individually to provide plasma levels of the active moiety which are sufficient to maintain the modulating effects, or minimal effective concentration (MEC).
  • MEC minimal effective concentration
  • the MEC will vary for each compound but can be estimated from in vitro data. Dosages necessary to achieve the MEC will depend on individual characteristics and route of administration. However, HPLC assays or bioassays can be used to determine plasma concentrations. Dosage intervals can also be determined using MEC value.
  • Compositions should be administered using a regimen which maintains plasma levels above the MEC for 10-90% of the time, preferably between 30-90% and most preferably between 50-90%. In cases of local administration or selective uptake, the effective local concentration of the drug may not be related to plasma concentration.
  • the attending physician would know how to and when to terminate, interrupt, or adjust administration due to toxicity or organ dysfunctions. Conversely, the attending physician would also know to adjust treatment to higher levels if the clinical response were not adequate (precluding toxicity).
  • the magnitude of an administrated dose in the management of the disorder of interest will vary with the severity of the condition to be treated and to the route of administration. The severity of the condition may, for example, be evaluated, in part, by standard prognostic evaluation methods. Further, the dose and perhaps dose frequency, will also vary according to the age, body weight, and response of the individual patient. A program comparable to that discussed above may be used in veterinary medicine.
  • the toxicology of a particular compound, or of a subset of the compounds, sharing certain chemical moieties may be established by determining in vitro toxicity towards a cell line, such as a mammalian, and preferably human, cell line. The results of such studies are often predictive of toxicity in animals, such as mammals, or more specifically, humans.
  • a cell line such as a mammalian, and preferably human, cell line.
  • the results of such studies are often predictive of toxicity in animals, such as mammals, or more specifically, humans.
  • the toxicity of particular compounds in an animal model, such as mice, rats, rabbits, or monkeys may be determined using known methods.
  • the efficacy of a particular compound may be established using several recognized methods, such as in vitro methods, animal models, or human clinical trials. When selecting a model to determine efficacy, the skilled artisan can be guided by the state of the art to choose an appropriate model, dose, route of administration and/or regime.
  • the intermediate was dissolved in anhydrous DCM (100 mL) and sym-collidine (17.9 g, 149.2 mmol), AgNO 3 (25 g, 149.2 mmol) and MMTrCl (45 g, 149.2 mmol) were added. The mixture was stirred at R.T. for 16 hours. The mixture was quenched with water, and the organic layer was separated and concentrated. The residue purified on a silica gel column (30% PE in EA) to give the crude product. The crude product was dissolved in 1M TBAF (50 mL) in THF. The mixture was stirred at R.T. for 2 hours. The solvent was removed, and the residue was purified on a silica gel column (50% PE in EA) to give P1-2 as a white solid (21.4 g, 66% for three steps).
  • the obtained intermediate was dissolved in anhydrous DCM (20 mL) and collidine (360 mg, 3 mmol), and AgNO 3 (500 mg, 3 mmol) and MMTrCl (606 mg, 2 mmol) were added. The mixture was stirred at R.T. for 16 hours. The reaction mixture was quenched with water, and the organic layer was separated and concentrated. The residue was purified on a silica gel column (0.5% MeOH in DCM) to give the fully protected intermediate as a yellow solid (3.3 g, 80%). The intermediate was dissolved in 1M TBAF in THF (5 mL) and was stirred at R.T. for 2 hours.
  • the reaction solution was washed with NaHCO 3 and brine.
  • the organic layer was dried over Na 2 SO 4 , and concentrated to give the crude as a light yellow solid.
  • the crude (236.4 g, 356.6 mmol) was dissolved in 80% HOAc aq. solution (500mL). The mixture was stirred at R.T. for 15 hours. The mixture was diluted with EtOAc and washed with a NaHCO 3 solution and brine.
  • the organic layer was dried over Na 2 SO 4 and purified by silica gel column chromatography (1-2% MeOH in DCM) to give P3-2 (131.2 g, 89.6%) as a light yellow solid.
  • DCM/MeOH 100:1 to 50:1
  • P9-2 (650 mg, 1.1 mmol), DMAP (270 mg, 2.2 mmol), TPSCl (664 mg, 2.2 mol) and Et 3 N (222 mg, 2.2 mmol) were dissolved in MeCN (20 mL). The mixture was stirred at R.T. for 14 hours. The reaction was added NH 3 in THF (saturated at 0°C), and the mixture was stirred at R.T. for 2 hours. The solvent was removed, and the residue was purified on a silica gel column (1-10% MeOH in DCM) to give P9-3 (430 mg, crude) as a light yellow syrup.
  • reaction mixture was quenched with saturated NaHCO 3 , and extracted with EA (100 mL x 2).
  • the combined organic layers was dried over Na 2 SO 4 , concentrated and purified by silica gel column (1 ⁇ 4% MeOH in DCM) to give the crude product (400 mg, 78.15%) as a yellow solid.
  • the crude product was treated with 80% HCOOH (50mL) at R.T. for 16 hours. The solvent was removed, and the residue was purified by RP HPLC to give compound 15a as a white solid (40 mg, 14%).
  • the filtrate was concentrated in vacuo to give a residue.
  • the residue was purified by pre-HPLC (MeCN and 0.1% HCOOH in water) to give the pure product as a white foam (2.4 g, 34 %).
  • the product was dissolved in dry pyridine (20 mL) and BzCl (723 mg, 5.2 mmol) was added dropwise at 0°C. The mixture was stirred at 0°C for 1 hour. The solution was quenched with NaHCO 3 solution, and extracted with EtOAc. The organic layer was dried over Na 2 SO 4 and concentrated.
  • the reaction mixture was stirred at 0°C for 90 mins.
  • the mixture was diluted with CH 2 Cl 2 (60 mL) and washed with saturated aq. NaHCO 3 (2 x 10 mL) and brine.
  • the combined aqueous layers were back extracted with CH 2 Cl 2 ( ⁇ 20 mL).
  • the combined organic extract was dried (Na 2 SO 4 ) and evaporated.
  • the residue purified on silica (25 g column) with CH 2 Cl 2 /i-PrOH solvent system (2-10% gradient). Yield: 140 mg (27%).
  • 1,2,4-Triazol (42 mg, 0.6 mmol) was suspended of dry CH 3 CN (1 mL). Triethylamine was added (0.088 mL, 0.63 mmol), and the mixture was vortexed to obtain a clear solution. After addition of POCl 3 (0.01 mL, 0.1 mmol), the mixture was vortexed and left for 20 min. The mixture was then centrifugated. The supernatant was added to the protected nucleoside (0.05 mmol), and the mixture was kept at ambient temperature for 1 hour. Tris(tetrabutylammonium) hydrogen pyrophosphate (180 mg, 0.2 mmol) was added, and the mixture was kept for 2 hours at R.T.
  • Table 1 Triphosphates obtained from Example 34
  • 1,2,4-Triazol (42 mg, 0.6 mmol) was suspended in dry CH 3 CN (1 mL). Triethylamine was added (0.088 mL, 0.63 mmol), and the mixture was vortexed to obtain a clear solution. After addition of POCl 3 (0.01 mL, 0.1 mmol), the mixture was vortexed and left for 20 mins. The mixture was centrifugated, and the supernatant was added to the protected nucleoside (0.05 mmol). The mixture was kept at ambient temperature for 1 hour. Tris(tetrabutylammonium) hydrogen pyrophosphate (180 mg, 0.2 mmol) was added, and the mixture was kept for 2 hours at R.T.
  • Compound 37a was synthesized by reaction of phosphor(tris-triazolide) with 4'-ethyl-2'-deoxy-2'-fluoro-uridine as described Examples 34 and 35.
  • the starting nucleoside (15 mg, 0.05 mmol) was dissolved in dry trimethylphosphate (3 mL). The solution was cooled to 4°C. POCl 3 (0.013 mL, 0.125 mmol) was added, followed by pyridine (0.01 mL, 0.125 mmol). In 1 hour, tributylamine (0.035mL, 0.125 mmol) was added at R.T. followed by tributylammonium pyrophosphate (156 mg, 0.34 mmol). Dry DMF (about 0.100 mL) was added to solubilize pyrophosphate. In 2 hours, the reaction was quenched with TEAB-buffer.
  • the intermediate was dissolved in anhydrous DMF (300 mL), and K 2 CO 3 (80.52g, 583.2 mmol) was added followed by PMBCl (31.7 g, 109.2 mmol). The mixture was stirred at R.T. overnight. The reaction was diluted with EA and washed with brine. The organic phase was dried over Na 2 SO 4 and concentrated to give crude 5'-O-DMTr-N3-PMB FdU (98.8 g) as a light yellow solid. The solid was dissolved in DMF (300 mL), and NaH (10.42 g, 260.5 mmol) was added followed by BnBr (73.8 g, 434.2 mmol). The reaction was stirred at R.T.
  • the crude ether was dissolved in anhydrous DCM (300 mL), and silver nitrate (66.03 g, 388.4 mmol, 2.0 eq) and collidine (235 mL, 1.94 mol, 10 eq) were added.
  • the mixture was stirred at R.T., and MMTrCl (239.3 g, 776.8 mmol, 4 eq) was added.
  • the mixture was filtered through Celite and filtrate was diluted with MTBE.
  • the solution was washed successively with 1M citric acid, diluted brine and 5% sodium bicarbonate.
  • the organic solution was dried over sodium sulfate and concentrated under vacuum to give the fully protected intermediate as a yellow foam.
  • reaction mixture was stirred at 0°C for 90 mins., and then diluted with CH 2 Cl 2 (30 mL) and washed with saturated aq. NaHCO 3 and brine. The combined aqueous layers were back extracted with CH 2 Cl 2 . The combined organic extract was dried (Na 2 SO 4 ), evaporated, and the residue purified on silica (10 g column) with CH 2 Cl 2 /i-PrOH solvent system (3-10% gradient). The obtained mixture of products were treated for 30 mins at 35°C with 80% aq. HCOOH, and then evaporated and coevaporated with toluene.
  • 47-2 was prepared from 46-1 (274 mg, 0.46 mmol) and propyonic anhydride (0.12 mL, 2 equiv.) in pyridine (5 mL) in the same manner as described for 46-2 (260 mg, 80%).
  • 48-2 was prepared from 46-1 (150 mg, 0.27 mmol) and valeric anhydride (0.11 mL, 2 equiv.) in pyridine (3 mL) in the same manner as described for 46-2 (150 mg, 73%).
  • 1,2,4-Triazol (21 mg, 0.3 mmol) was dissolved in the mixture of CH 3 CN (0.7 mL) and Et 3 N (44 ⁇ L, 0.31 mmol). POCl 3 (9 ⁇ l, 0.1 mmol) was added, and the mixture was kept at R.T. for 20 mins. The white precipitate was filtered, and the filtrate added to the dry nucleoside (28 mg, 0.05 mmol). The reaction was controlled by TLC and monitored by the disappearance of the starting nucleoside. After completion of the reaction, tetrabutylammonium salt of pyrophosphate (150 mg) was added, followed by DMF (0.5 mL) to get a homogeneous solution.
  • reaction was diluted with water (4 mL) and extracted with DCM (2 x 5 mL). The combined organic extracts were evaporated, dissolved in 5 mL of 80% HCOOH and left for 2 hours at R.T.
  • the reaction mixture was concentrated and distributed between water (5 mL) and DCM (5 mL).
  • the aqueous fraction was loaded on the column HiLoad 16/10 with Q Sepharose High Performance. Separation was done in a linear gradient of NaCl from 0 to 1N in 50mM TRIS-buffer (pH7.5). Two fractions were obtained. The first fraction, containing the monophosphate ( 55a ) was eluted at 70-75%B.
  • triphosphate (56a) was eluted at 75-80%B. Both fractions were desalted by RP HPLC on Synergy 4 micron Hydro-RP column (Phenominex). A linear gradient of methanol from 0 to 30% in 50mM triethylammonium acetate buffer (pH 7.5) was used for elution. The corresponding fractions were combined, concentrated and lyophilized 3 times to remove excess of buffer.
  • 1,2,4-Triazol (21 mg, 0.3 mmol) was dissolved in the mixture of CH 3 CN (0.7 mL) and Et 3 N (44 ⁇ L, 0.31 mmol). POCl 3 (9ul, 0.1 mmol) was added, and the mixture was kept at R.T. for 20 mins. The white precipitate was filtered, and the filtrate added to the dry nucleoside (28 mg, 0.05 mmol). The reaction was controlled by TLC and monitored by the disappearance of the starting nucleoside. After completion of the reaction, tetrabutylammonium salt of pyrophosphate (150 mg) was added followed by DMF (0.5 mL) to get a homogeneous solution.
  • reaction was diluted with water (4 mL) and extracted with DCM (2 x 5 mL). The combined organic extracts were evaporated, dissolved in 5 mL of 80% HCOOH and left for 4 hours at 38°C. The reaction mixture was concentrated and distributed between water (5 mL) and DCM (5 mL). The aqueous fraction was loaded on the column HiLoad 16/10 with Q Sepharose High Performance. Separation was done in a linear gradient of NaCl from 0 to 1N in 50 mM TRIS-buffer (pH7.5). Two fractions were obtained. The triphosphate ( 56b-e ) was eluted at 75-80%B.
  • Desaltin was performed by RP HPLC on Synergy 4 micron Hydro-RP column (Phenominex). A linear gradient of methanol from 0 to 30% in 50 mM triethylammonium acetate buffer (pH 7.5) was used for elution. The corresponding fractions were combined, concentrated and lyophilized 3 times to remove excess of buffer.
  • the cytidine derivative (1.35 g, 1.5 mmol) was dissolved in 80% AcOH (40 mL), and the mixture was stirred at 60°C for 2 h. The mixture was concentrated, and the residue was purified on a silica gel column using 5% MeOH in DCM as elute to give 71a as a white solid (180 mg, 35 %).

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